OECD country
0 = No
1 = Yes
2 = Not Applicable

Stratum ID (Bundesland, Foerderschule, Berufsschule) (FDZ)
1 = DEU - stratum 01: NOR\Baden-Wuerttemberg (BW)
2 = DEU - stratum 02: NOR\Bayern (BY)
3 = DEU - stratum 03: NOR\Berlin (BE)
4 = DEU - stratum 04: NOR\Brandenburg (BB)
5 = DEU - stratum 05: NOR\Bremen (HB)
6 = DEU - stratum 06: NOR\Hamburg (HH)
7 = DEU - stratum 07: NOR\Hessen (HE)
8 = DEU - stratum 08: NOR\Mecklenburg-Vorpommern (MV)
9 = DEU - stratum 09: NOR\Niedersachsen (NI)
10 = DEU - stratum 10: NOR\Nordrhein-Westfalen (NW)
11 = DEU - stratum 11: NOR\Rheinland-Pfalz (RP)
12 = DEU - stratum 12: NOR\Saarland (SL)
13 = DEU - stratum 13: NOR\Sachsen (SN)
14 = DEU - stratum 14: NOR\Sachsen-Anhalt (ST)
15 = DEU - stratum 15: NOR\Schleswig-Holstein (SH)
16 = DEU - stratum 16: NOR\Thueringen (TH)
17 = DEU - stratum 17: SEN schools
18 = DEU - stratum 18: Vocational Schools

Mode of Respondent
1 = Paper
2 = Computer

Collaborative Problem Solving Option
0 = No
1 = Yes

Science Cluster Combination Random Number (S)
1 = Science Random Number 1
2 = Science Random Number 2
3 = Science Random Number 3
4 = Science Random Number 4
5 = UH Form
6 = Science Random Number 5
7 = Science Random Number 6

What <grade> are you in? <Grade>
1 = grade 1 (vocational school)>
2 = grade 2 (vocational school)>
3 = grade 3 (vocational school)>
4 = grade 7
5 = grade 8
6 = grade 9
7 = grade 10
8 = grade 11
9 = grade 12
10 = grade 13
95 = Valid Skip
96 = Not Reached
97 = Not Applicable
98 = Invalid
99 = No Response

What <grade> are you in? <Grade> (Zur Anonymisierung gruppiert (FDZ))
1 = grade 1 and 2 (vocational school)>
2 = grade 2 (vocational school)>
3 = grade 3 (vocational school)>
4 = grade 7
5 = grade 8
6 = grade 9
7 = grade 10
8 = grade 11
9 = grade 12 and 13
10 = grade 13
95 = Valid Skip
96 = Not Reached
97 = Not Applicable
98 = Invalid
99 = No Response

Which one of the following <programmes> are you in?
1 = Lower secondary with access to upper secondary (comprehensive)
2 = Lower secondary without access to upper secondary, providing a basic general education (grade 5 - 10)
3 = Lower secondary without access to upper secondary, providing an extensive general education (grade 5-10)
4 = Upper secondary or lower secondary with access to upper secondary
5 = Lower secondary with access to upper secondary (comprehensive)
6 = Lower secondary without access to upper secondary, providing a basic general education (grades 5 -10)
7 = Lower secondary with or without access to upper secondary, providing an extemsive general education (grades 5 - 10)
8 = Upper secondary or lower secondary with access to upper secondary
9 = Lower secondary without access to upper secondary, providing a basic general education (grades 5 - 10)
10 = Lower secondary without access to upper secondary, providing an extensive general education (grades 5 - 10)
11 = Lower secondary without access to upper secondary, providing a basic general education (grades 5 - 10)
12 = Lower secondary without access to upper secondary, providing an extensive general education (grades 5 - 10)
13 = Lower secondary with access to upper secondary (comprehensive)
14 = Pre-vocational training year upper secondary level
15 = Vocational school upper secondary level
16 = Vocational school
95 = Valid Skip
96 = Not Reached
97 = Not Applicable
98 = Invalid
99 = No Response

Schulart Deutschland
1 = Hauptschule
2 = MBG
3 = Gesamtschule (IG)
4 = Realschule
5 = Gymnasium
6 = Berufliche Schulen (BS)
8 = Sonderschule/Foerderschule

Student (Standardized) Birth - Month
1 = January
2 = February
3 = March
4 = April
5 = May
6 = June
7 = July
8 = August
9 = September
10 = October
11 = November
12 = December
95 = Valid Skip
96 = Not Reached
97 = Not Applicable
98 = Invalid
99 = No Response

On what date were you born? Year
1 = 1995
2 = 1996
3 = 1997
4 = 1998
5 = 1999
6 = 2000
7 = 2001
8 = 2002
9 = 2003
95 = Valid Skip
96 = Not Reached
97 = Not Applicable
98 = Invalid
99 = No Response

On what date were you born? Year? (Zur Anonymisierung gruppiert (FDZ))
1 = 1995 bis 1997
2 = 1996
3 = 1997
4 = 1998
5 = 1999
6 = 2000 bis 2003
7 = 2001
8 = 2002
9 = 2003
95 = Valid Skip
96 = Not Reached
97 = Not Applicable
98 = Invalid
99 = No Response

Student (Standardized) Gender
1 = Female
2 = Male
5 = Valid Skip
6 = Not Reached
7 = Not Applicable
8 = Invalid
9 = No Response

What is the highest level of schooling completed by your mother?
1 = ISCED level 3A
2 = ISCED level 3B, 3C
3 = ISCED level 2
4 = ISCED level 2
5 = ISCED level 2
6 = ISCED level 1
7 = Others
8 = She did not complete <ISCED level 1>
9 = She did not attend school.
95 = Valid Skip
96 = Not Reached
97 = Not Applicable
98 = Invalid
99 = No Response

Does your mother have this qualification? <ISCED level 6>
1 = Yes
2 = No
5 = Valid Skip
6 = Not Reached
7 = Not Applicable
8 = Invalid
9 = No Response

What is the highest level of schooling completed by your father?
1 = ISCED level 3A
2 = ISCED level 3B, 3C
3 = ISCED level 2
4 = ISCED level 2
5 = ISCED level 2
6 = ISCED level 1
7 = Others
8 = He did not complete <ISCED level 1>
9 = He did not attend school.
95 = Valid Skip
96 = Not Reached
97 = Not Applicable
98 = Invalid
99 = No Response

How many in your home: Televisions
1 = None
2 = One
3 = Two
4 = Three or more
5 = Valid Skip
6 = Not Reached
7 = Not Applicable
8 = Invalid
9 = No Response

How many books are there in your home?
1 = 0-10 books
2 = 11-25 books
3 = 26-100 books
4 = 101-200 books
5 = 201-500 books
6 = More than 500 books
95 = Valid Skip
96 = Not Reached
97 = Not Applicable
98 = Invalid
99 = No Response

Is your mother working as an employee or is she self-employed?
1 = Employee (working for someone else)
2 = Self-employed (has her own business, is her own boss)
3 = I don't know
5 = Valid Skip
6 = Not Reached
7 = Not Applicable
8 = Invalid
9 = No Response

At her job, does your mother have any formal responsibility for supervising the work of other employees?
1 = 1-10 Personen
2 = Mehr als 10 Personen
3 = Keine
4 = Weiss ich nicht
5 = Valid Skip
6 = Not reached
7 = Not applicable
8 = Invalide
9 = No Response

Is your father working as an employee or is he self-employed?
1 = Employee (working for someone else)
2 = Self-employed (has his own business, is his own boss)
3 = I don't know
5 = Valid Skip
6 = Not Reached
7 = Not Applicable
8 = Invalid
9 = No Response

<this academic year>: My parents are interested in my school activities.
1 = Strongly disagree
2 = Disagree
3 = Agree
4 = Strongly agree
5 = Valid Skip
6 = Not Reached
7 = Not Applicable
8 = Invalid
9 = No Response

In what country were you and your parents born? You
1 = Germany
2 = Greece
3 = Italy
4 = Bosnia-Herzegovina
5 = Croatia
6 = Macedonia
7 = Montenegro
8 = Serbia
9 = Slovenia
10 = Poland
11 = Russia
12 = Turkey
13 = Other country
95 = Valid Skip
96 = Not Reached
97 = Not Applicable
98 = Invalid
99 = No Response

How old were you when you arrived in <country of test>?
1 = age 0 - 1
2 = age 1
3 = age 2
4 = age 3
5 = age 4
6 = age 5
7 = age 6
8 = age 7
9 = age 8
10 = age 9
11 = age 10
12 = age 11
13 = age 12
14 = age 13
15 = age 14
16 = age 15
17 = age 16
95 = Valid Skip
96 = Not Reached
97 = Not Applicable
98 = Invalid
99 = No Response

How old were you when you arrived in <country of test>? (Zur Anonymisierung gruppiert (FDZ))
1 = age 0 - 1
2 = age 1
3 = age 2
4 = age 3
5 = age 4
6 = age 5
7 = age 6
8 = age 7
9 = age 8
10 = age 9
11 = age 10
12 = age 11
13 = age 12
14 = age 13
15 = age 14 - 15
16 = age 15
17 = age 16
95 = Valid Skip
96 = Not Reached
97 = Not Applicable
98 = Invalid
99 = No Response

What language do you speak at home most of the time?
1 = German
2 = Greek
3 = Italian
4 = Croat
5 = Polish
6 = Russian
7 = Serbian
8 = Turkish
9 = Kurdish
10 = Other language
95 = Valid Skip
96 = Not Reached
97 = Not Applicable
98 = Invalid
99 = No Response

How old were you when you started <ISCED 0>? Years
1 = 1 year or younger
2 = 2 years
3 = 3 years
4 = 4 years
5 = 5 years
6 = 6 years or older
7 = I did not attend <ISCED 0>
8 = I do not remember
95 = Valid Skip
96 = Not Reached
97 = Not Applicable
98 = Invalid
99 = No Response

How old were you when you started <ISCED 1>? Years
1 = 3 or younger
2 = 4
3 = 5
4 = 6
5 = 7
6 = 8
7 = 9 or older
95 = Valid Skip
96 = Not Reached
97 = Not Applicable
98 = Invalid
99 = No Response

Have you ever repeated a <grade>? At <ISCED 1>
1 = No, never
2 = Yes, once
3 = Yes, twice or more
5 = Valid Skip
6 = Not Reached
7 = Not Applicable
8 = Invalid
9 = No Response

Overall, how satisfied are you with your life as a whole these days?
95 = Valid Skip
96 = Not Reached
97 = Not Applicable
98 = Invalid
99 = No Response

Which of the following do you expect to complete?
1 = ISCED level 1
2 = ISCED level 2
3 = ISCED level 2
4 = ISCED level 3B, 3C
5 = ISCED level 3A
6 = ISCED level 3A
7 = ISCED level 4
8 = ISCED level 5B
9 = ISCED level 5A
10 = ISCED level 5A
11 = ISCED level 6
95 = Valid Skip
96 = Not Reached
97 = Not Applicable
98 = Invalid
99 = No Response

I feel like an outsider (or left out of things) at school.
1 = Strongly agree
2 = Agree
3 = Disagree
4 = Strongly disagree
5 = Valid Skip
6 = Not Reached
7 = Not Applicable
8 = Invalid
9 = No Response

Teachers called on me less often than they called on other students.
1 = Never or almost never
2 = A few times a year
3 = A few times a month
4 = Once a week or more
5 = Valid Skip
6 = Not Reached
7 = Not Applicable
8 = Invalid
9 = No Response

Number of <class periods> required per week in <test language>
995 = Valid Skip
996 = Not Reached
997 = Not Applicable
998 = Invalid
999 = No Response

In the last two full weeks of school, how often: I <skipped> a whole school day
1 = None
2 = One or two times
3 = Three or four times
4 = Five or more times
5 = Valid Skip
6 = Not Reached
7 = Not Applicable
8 = Invalid
9 = No Response

On avg, how many days do you attend physical education classes each week?
1 = 0 days
2 = 1 day
3 = 2 days
4 = 3 days
5 = 4 days
6 = 5 days
7 = 6 days
8 = 7 days
95 = Valid Skip
96 = Not Reached
97 = Not Applicable
98 = Invalid
99 = No Response

Which <school science> course did you attend? Physics: This year
0 = Not checked
1 = Checked
5 = Valid Skip
6 = Not Reached
7 = Not Applicable
8 = Invalid
9 = No Response

<school science> courses? I can choose the <school science> course(s) I study.
1 = No, not at all
2 = Yes, to a certain degree
3 = Yes, I can choose freely
5 = Valid Skip
6 = Not Reached
7 = Not Applicable
8 = Invalid
9 = No Response

How often does this happen in your <school science> lessons? Students don't listen to what the teacher says.
1 = Every lesson
2 = Most lessons
3 = Some lessons
4 = Never or hardly ever
5 = Valid Skip
6 = Not Reached
7 = Not Applicable
8 = Invalid
9 = No Response

When learning <school science>? Students are given opportunities to explain their ideas.
1 = In all lessons
2 = In most lessons
3 = In some lessons
4 = Never or hardly ever
5 = Valid Skip
6 = Not Reached
7 = Not Applicable
8 = Invalid
9 = No Response

How often does this happen in <school science>? The teacher explains scientific ideas.
1 = Never or almost never
2 = Some lessons
3 = Many lessons
4 = Every lesson or almost every lesson
5 = Valid Skip
6 = Not Reached
7 = Not Applicable
8 = Invalid
9 = No Response

How often happen in <school science>? Students write up laboratory reports.
1 = Never or hardly ever
2 = Some lessons
3 = Many lessons
4 = Every lesson or almost every lesson
5 = Valid Skip
6 = Not Reached
7 = Not Applicable
8 = Invalid
9 = No Response

How informed are you about this environmental issue? The increase of greenhouse gases in the atmosphere
1 = I have never heard of this
2 = I have heard about this but I would not be able to explain what it is really about
3 = I know something about this and could explain the general issue
4 = I am familiar with this and I would be able to explain this well
5 = Valid Skip
6 = Not Reached
7 = Not Applicable
8 = Invalid
9 = No Response

This issue will improve or get worse over next 20 years? Air pollution (student)
1 = Improve
2 = Stay about the same
3 = Get worse
5 = Valid Skip
6 = Not Reached
7 = Not Applicable
8 = Invalid
9 = No Response

To what extent are you interested in: The concept of an organism (e.g. unicellular and multicellular)
1 = Not interested
2 = Hardly interested
3 = Interested
4 = Highly interested
5 = I don't know what this is
95 = Valid Skip
96 = Not Reached
97 = Not Applicable
98 = Invalid
99 = No Response

Making an effort in my <school science> subject(s) is worth it because this will help me in the work I want to do lat
1 = Strongly Agree
2 = Agree
3 = Disagree
4 = Strongly Disagree
5 = Valid Skip
6 = Not Reached
7 = Not Applicable
8 = Invalid
9 = No Response

Recognise the science question that underlies a newspaper report on a health issue.
1 = I could do this easily
2 = I could do this with a bit of effort
3 = I would struggle to do this on my own
4 = I couldn't do this
5 = Valid Skip
6 = Not Reached
7 = Not Applicable
8 = Invalid
9 = No Response

How often do you do these things? Watch TV programmes about <broad science>
1 = Very often
2 = Regularly
3 = Sometimes
4 = Never or hardly ever
5 = Valid Skip
6 = Not Reached
7 = Not Applicable
8 = Invalid
9 = No Response

Student coded science class (from ST065Q01NA)
1 = Physics
2 = Chemistry
3 = Biology
4 = Earth and space
5 = Applied sciences and technology
6 = General, integrated, or comprehensive science
7 = Could not determine
95 = Valid Skip
96 = Not Reached
97 = Not Applicable
98 = Invalid
99 = No Response

How interested are you in? <Test language>
1 = Not interested
2 = Hardly interested
3 = Interested
4 = Highly interested
5 = I didn't have this subject
95 = Valid Skip
96 = Not Reached
97 = Not Applicable
98 = Invalid
99 = No Response

Use digital devices outside school for playing one-player games.
1 = Never or hardly ever
2 = Once or twice a month
3 = Once or twice a week
4 = Almost every day
5 = Every day
95 = Valid Skip
96 = Not Reached
97 = Not Applicable
98 = Invalid
99 = No Response

In your family, who helps you regularly with your homework or private study? Mother or other female guardian
1 = Never or almost never
2 = Rarely
3 = Often
4 = Always or Almost always
5 = Valid Skip
6 = Not Reached
7 = Not Applicable
8 = Invalid
9 = No Response

Did you change schools when you were attending <ISCED 1>?
1 = No, I attended all of <ISCED 1> at the same school.
2 = Yes, I changed schools once.
3 = Yes, I changed schools twice or more.
5 = Valid Skip
6 = Not Reached
7 = Not Applicable
8 = Invalid
9 = No Response

Did you change schools when you were attending <ISCED 2>?
1 = No, I attended all of <ISCED 2> at the same school.
2 = Yes, I changed schools once.
3 = Yes, I changed schools twice or more.
5 = Valid Skip
6 = Not Reached
7 = Not Applicable
8 = Invalid
9 = No Response

Information on future studies or occupational area: intership
1 = Yes
2 = No, never
5 = Valid Skip
6 = Not Reached
7 = Not Applicable
8 = Invalid
9 = No Response

Watched TV programmes about science
1 = Very Often
2 = Regularly
3 = Sometimes
4 = Never
5 = Valid Skip
6 = Not Reached
7 = Not Applicable
8 = Invalid
9 = No Response

Discuss how well my child is doing at school.
1 = Never or hardly ever
2 = Once or twice a year
3 = Once or twice a month
4 = Once or twice a week
5 = Every day or almost every day
95 = Valid Skip
96 = Not Reached
97 = Not Applicable
98 = Invalid
99 = No Response

Which of the following statements best describes the schooling available to students in your location?
1 = There are two or more other schools in this area that compete with the school my child is currently attending.
2 = There is one other school in this area that competes with the school my child is currently attending.
3 = There are no other schools in this area that compete with the school my child is currently attending.
5 = Valid Skip
6 = Not Reached
7 = Not Applicable
8 = Invalid
9 = No Response

The school is at a short distance to home.
1 = Not important
2 = Somewhat important
3 = Important
4 = Very important
5 = Valid Skip
6 = Not Reached
7 = Not Applicable
8 = Invalid
9 = No Response

<the last academic year>, particip.\ school-related activity? Discussed child's behaviour with a teacher on my own in
1 = Yes
2 = No
3 = Not supported by school
5 = Valid Skip
6 = Not Reached
7 = Not Applicable
8 = Invalid
9 = No Response

How many parents of your childs friends at this school do you know?
1 = 0
2 = 1-2
3 = 3-5
4 = 6 or more
5 = Valid Skip
6 = Not Reached
7 = Not Applicable
8 = Invalid
9 = No Response

At what age did your child start attending <ISCED 1>? (Zur Anonymisierung gruppiert (FDZ))
9 = age 9 - 14
95 = Valid Skip
96 = Not Reached
97 = Not Applicable
98 = Invalid
99 = No Response

What was the most important reason why your child attended a <supervision and care arrangement>?
1 = Attendance was mandatory.
2 = We\I could not care for the child (e. g. work, illness).
3 = We\I wanted additional learning stimulation for the child (e. g., social, academic).
4 = Most other children attended a < supervision and care arrangement>.
5 = Valid Skip
6 = Not Reached
7 = Not Applicable
8 = Invalid
9 = No Response

What was the most important reason why your child attended an <early childhood educational development arrangement>?
1 = Attendance was mandatory.
2 = We\I could not care for the child (e. g. work, illness).
3 = We\I wanted additional learning stimulation for the child (e. g., social, academic).
4 = Most other children attended an <early childhood educational development arrangement>.
5 = Valid Skip
6 = Not Reached
7 = Not Applicable
8 = Invalid
9 = No Response

What type of provider offered this <pre-primary education arrangement>?
1 = Public management and mainly public funding (e.g. <national example>)
2 = Private management and mainly public funding (e.g. <national example>)
3 = Private management and mainly private funding (e.g. <national example>)
5 = Valid Skip
6 = Not Reached
7 = Not Applicable
8 = Invalid
9 = No Response

How many hours per week did your child attend a <pre-primary education arrangement> at the age of three years?
1 = 0 hours per week
2 = up to 10 hours per week
3 = 11-20 hours per week
4 = 21-30 hours per week
5 = 31-40 hours per week
6 = 41-50 hours per week
7 = 51 hours per week or more
95 = Valid Skip
96 = Not Reached
97 = Not Applicable
98 = Invalid
99 = No Response

How many hours per week did your child attend a <pre-primary education arrangement> at the age of three years? (Zur Anonymisierung gruppiert (FDZ))
1 = 0 hours per week
2 = up to 10 hours per week
3 = 11-20 hours per week
4 = 21-30 hours per week
5 = 31-40 hours per week
6 = 41 hours per week or more
7 = 51 hours per week or more
95 = Valid Skip
96 = Not Reached
97 = Not Applicable
98 = Invalid
99 = No Response

What was the most important reason why your child attended a <pre-primary education arrangement>?
1 = Attendance was mandatory.
2 = We\I could not care for the child (e.g. work, illness).
3 = We\I wanted additional learning stimulation for the child (e.g., social, academic).
4 = Most other children attended a <pre-primary education arrangement>.
5 = Valid Skip
6 = Not Reached
7 = Not Applicable
8 = Invalid
9 = No Response

Environmental issues as a serious concern? Air pollution
1 = This is a serious concern for me personally as well as others
2 = This is a serious concern for other people in my country but not me personally
3 = This is a serious concern only for people in other countries
4 = This is not a serious concern for anyone
5 = Valid Skip
6 = Not Reached
7 = Not Applicable
8 = Invalid
9 = No Response

Does the child’s father have any of the following qualifications? ISCED 6
1 = Yes
2 = No
95 = Valid Skip
96 = Not Reached
97 = Not Applicable
98 = Invalid
99 = No Response

In the last twelve months, about how much would you have paid to educational providers for services?
1 = Nichts
2 = 1 € oder mehr, aber weniger als 50 €
3 = 50 € oder mehr, aber weniger als 250 €
4 = 250 € oder mehr, aber weniger als 500 €
5 = 500 € oder mehr, aber weniger als 1 200 €
6 = 1 200 € oder mehr

What is your annual household income?
1 = Weniger als 20 000 €
2 = 20 000 € oder mehr, aber weniger als 30 000 €
3 = 30 000 € oder mehr, aber weniger als 40 000 €
4 = 40 000 € oder mehr,aber weniger als 50 000 €
5 = 50 000 € oder mehr, aber weniger als 60 000 €
6 = 60 000 € oder mehr

9995 = Valid Skip
9996 = Not Reached
9997 = Not Applicable
9998 = Invalid
9999 = No Response

ISCED level
1 = ISCED level 1
2 = ISCED level 2
3 = ISCED level 3
4 = ISCED level 4
5 = Valid Skip
6 = Not Reached
7 = Not Applicable
8 = Invalid
9 = No Response

ISCED designation
1 = A
2 = B
3 = C
4 = M
5 = Valid Skip
6 = Not Reached
7 = Not Applicable
8 = Invalid
9 = No Response

ISCED orientation
1 = General
2 = Pre-Vocational
3 = Vocational
4 = Modular
5 = Valid Skip
6 = Not Reached
7 = Not Applicable
8 = Invalid
9 = No Response

Students’ expected occupational status (SEI)
9999995 = Valid Skip
9999996 = Not Reached
9999997 = Not Applicable
9999998 = Invalid
9999999 = No Response

Index Immigration status
1 = Native
2 = Second-Generation
3 = First-Generation
5 = Valid Skip
6 = Not Reached
7 = Not Applicable
8 = Invalid
9 = No Response

Mother’s Education (ISCED)
0 = None
1 = ISCED 1
2 = ISCED 2
3 = ISCED 3B, C
4 = ISCED 3A, ISCED 4
5 = ISCED 5B
6 = ISCED 5A, 6
95 = Valid Skip
96 = Not Reached
97 = Not Applicable
98 = Invalid
99 = No Response

Grade Repetition
0 = Did not repeat a <grade>
1 = Repeated a <grade>
5 = Valid Skip
6 = Not Reached
7 = Not Applicable
8 = Invalid
9 = No Response

Duration in early childhood education and care
0 = Attended ECEC for less than a year
1 = Attended ECEC for at least one but less than two years
2 = Attended ECEC for at least two but less than three years
3 = Attended ECEC for at least three but less than four years
4 = Attended ECEC for at least four but less than five years
5 = Attended ECEC for at least five but less than six years
6 = Attended ECEC for at least six but less than seven years
7 = Attended ECEC for at least seven but less than eight years
8 = Attended ECEC for at least eight years
95 = Valid Skip
96 = Not Reached
97 = Not Applicable
98 = Invalid
99 = No Response

Learning time (minutes per week) - <Mathematics>
99999995 = Valid Skip
99999996 = Not Reached
99999997 = Not Applicable
99999998 = Invalid
99999999 = No Response

Number of school changes
0 = no change
1 = one change
2 = two or more changes
5 = Valid Skip
6 = Not Reached
7 = Not Applicable
8 = Invalid
9 = No Response

Number of changes in educational biography (Sum)
5 = Valid Skip
6 = Not Reached
7 = Not Applicable
8 = Invalid
9 = No Response

Language at home (3-digit code)
602 = Minority languages Bulgarian dialects (BGR)
622 = Serbian of a yekavian variant or Montenegrin
627 = Other National dialects or languages (ROU)
639 = Other former Yugoslavian languages (SVN)

REP_BWGT: RANDOMLY ASSIGNED UNIT NUMBER
1 = final variance unit 1
2 = final variance unit 2
3 = final variance unit 3

Country code 3-character (FDZ)
1 = Germany

PISA Assessment Cycle (2 digits + 2 character Assessment type - MS\FT) (FDZ)
1 = 06MS

Reading Option (FDZ)
1 = Standard Cluster

In your home: <Country-specific wealth item 1> (FDZ)
1 = Germany : A game console (z. B. Playstation®, Nintendo®, X-Box®, Wii®) - Yes
2 = Germany : A game console (z. B. Playstation®, Nintendo®, X-Box®, Wii®) - No

In your home: <Country-specific wealth item 2> (FDZ)
1 = Germany : A TV in your room - Yes
2 = Germany : A TV in your room - No

In your home: <Country-specific wealth item 3> (FDZ)
1 = Germany : Audiobooks - Yes
2 = Germany : Audiobooks - No

Unique national study programme code (FDZ)
1 = Germany: Lower secondary, some with access to upper secondary (special education)
2 = Germany: Lower secondary, some with access to upper secondary; basic gen educ (exclusively students of the same track
3 = Germany: Lower secondary, access to upper secondary; extensive gen educ (exclusively students of the same track)
4 = Germany: Lower secondary, access to upper secondary; academic education (exclusively students of the same track)
5 = Germany: Upper secondary (exclusively students of the same track [cf. key 4])
6 = Germany: Lower secondary comprehensive, achievement-based access to upper secondary (within school streaming)
7 = Germany: Upper secondary comprehensive (taught together with students of other tracks at lower secondary [cf. key 6])
8 = Germany: Lower secondary comprehensive, no access to upper; basic general education (different tracks taught separate
9 = Germany: Lower secondary comprehensive, access to upper; extensive gen educ (different tracks taught separately)
10 = Germany: Lower secondary comprehensive, access to upper secondary; academic educ (different tracks taught separately)
11 = Germany: Upper secondary comprehensive (after lower secondary with different tracks taught separately [cf. key 10])
12 = Germany: Lower secondary, expectedly no access to upper; basic gen educ (students of different tracks taught together
13 = Germany: Lower secondary, expectedly access to upper; extensive gen educ (students of different tracks taught togethe
14 = Germany: Lower secondary, no access to upper; basic general education (students of different tracks taught separately
15 = Germany: Lower secondary, access to upper; extensive general education (students of different tracks taught separatel
16 = Germany: Lower secondary with access to upper (Waldorf school)
17 = Germany: Pre-vocational training year upper secondary level
18 = Germany: Vocational school upper secondary level
19 = Germany: Vocational school

Date of the database creation (FDZ)
1 = 15NOV16:14:44:40

Country of Birth National Categories- Father
1 = Bosnia and Herzegovina
2 = Croatia
3 = Germany
4 = Greece
5 = Italy
6 = Montenegro
7 = Poland
8 = Serbia
9 = Slovenia
10 = Turkey
11 = FYR Macedonia
12 = One of the former USSR republics
13 = Another country (DEU)

Country of Birth National Categories- Father (Zur Anonymisierung gruppiert (FDZ))
1 = Bosnia and Herzegovina
2 = Croatia
3 = Germany
4 = Greece
5 = Italy
6 = Montenegro
7 = Poland
8 = Serbia
9 = Slovenia
10 = Turkey
11 = FYR Macedonia
12 = One of the former USSR republics
13 = Another country (DEU)
14 = Missing

Country of Birth National Categories- Self
1 = Bosnia and Herzegovina
2 = Croatia
3 = Germany
4 = Greece
5 = Italy
6 = Montenegro
7 = Poland
8 = Serbia
9 = Turkey
10 = FYR Macedonia
11 = One of the former USSR republics
12 = Another country (DEU)

1 = Bosnia and Herzegovina
2 = Croatia
3 = Germany
4 = Greece
5 = Italy
6 = Montenegro
7 = Poland
8 = Serbia
9 = Turkey
10 = FYR Macedonia
11 = One of the former USSR republics
12 = Missing

ISCO-08 Occupation code - Mother
6000 = Skilled agricultural, forestry and fishery workers
8000 = Plant and machine operators, and assemblers
1100 = Chief executives, senior officials and legislators
3100 = Science and engineering associate professionals
7100 = Building and related trades workers, excluding electricians
6200 = Market-oriented skilled forestry, fishery and hunting workers
7200 = Metal, machinery and related trades workers
9200 = Agricultural, forestry and fishery labourers
1300 = Production and specialised services managers
3300 = Business and administration associate professionals
6300 = Subsistence farmers, fishers, hunters and gatherers
9300 = Labourers in mining, construction, manufacturing and transport
1400 = Hospitality, retail and other services managers
3400 = Legal, social, cultural and related associate professionals
7400 = Electrical and electronic trades workers
2500 = Information and communications technology professionals
7500 = Food processing, wood working, garment and other craft and related trades workers
9500 = Street and related sales and service workers
2600 = Legal, social and cultural professionals
9600 = Refuse workers and other elementary workers
2110 = Physical and earth science professionals
3110 = Physical and engineering science technicians
5110 = Travel attendants, conductors and guides
7110 = Building frame and related trades workers
8110 = Mining and mineral processing plant operators
9110 = Domestic, hotel and office cleaners and helpers
1210 = Business services and administration managers
4210 = Tellers, money collectors and related clerks
7210 = Sheet and structural metal workers, moulders and welders, and related workers
9210 = Agricultural, forestry and fishery labourers
1310 = Production managers in agriculture, forestry and fisheries
2310 = University and higher education teachers
3310 = Financial and mathematical associate professionals
8310 = Locomotive engine drivers and related workers
3410 = Legal, social and religious associate professionals
7410 = Electrical equipment installers and repairers
2510 = Software and applications developers and analysts
3510 = Information and communications technology operations and user support technicians
7510 = Food processing and related trades workers
3120 = Mining, manufacturing and construction supervisors
7120 = Building finishers and related trades workers
8120 = Metal processing and finishing plant operators
9120 = Vehicle, window, laundry and other hand cleaning workers
1220 = Sales, marketing and development managers
3220 = Nursing and midwifery associate professionals
7220 = Blacksmiths, toolmakers and related trades workers
1320 = Manufacturing, mining, construction, and distribution managers
5320 = Personal care workers in health services
7420 = Electronics and telecommunications installers and repairers
7520 = Wood treaters, cabinet-makers and related trades workers
7130 = Painters, building structure cleaners and related trades workers
8130 = Chemical and photographic products plant and machine operators
2230 = Traditional and complementary medicine professionals
3230 = Traditional and complementary medicine associate professionals
1330 = Information and communications technology service managers
6330 = Subsistence mixed crop and livestock farmers
2430 = Sales, marketing and public relations professionals
3430 = Artistic, cultural and culinary associate professionals
3140 = Life science technicians and related associate professionals
5140 = Hairdressers, beauticians and related workers
8140 = Rubber, plastic and paper products machine operators
2340 = Primary school and early childhood teachers
6340 = Subsistence fishers, hunters, trappers and gatherers
3150 = Ship and aircraft controllers and technicians
8150 = Textile, fur and leather products machine operators
2160 = Architects, planners, surveyors and designers
8160 = Food and related products machine operators
8170 = Wood processing and papermaking plant operators
8180 = Other stationary plant and machine operators
3111 = Chemical and physical science technicians
3211 = Medical imaging and therapeutic equipment technicians
1311 = Agricultural and forestry production managers
3311 = Securities and finance dealers and brokers
3511 = Information and communications technology operations technicians
7511 = Butchers, fishmongers and related food preparers
7221 = Blacksmiths, hammersmiths and forging press workers
9621 = Messengers, package deliverers and luggage porters
2131 = Biologists, botanists, zoologists and related professionals
8131 = Chemical products plant and machine operators
1431 = Sports, recreation and cultural centre managers
7531 = Tailors, dressmakers, furriers and hatters
3141 = Life science technicians (excluding medical)
8341 = Mobile farm and forestry plant operators
5151 = Cleaning and housekeeping supervisors in offices, hotels and other establishments
8151 = Fibre preparing, spinning and winding machine operators
5161 = Astrologers, fortune-tellers and related workers
8112 = Mineral and stone processing plant operators
9112 = Cleaners and helpers in offices, hotels and other establishments
3212 = Medical and pathology Labouratory technicians
4212 = Bookmakers, croupiers and related gaming workers
8212 = Electrical and electronic equipment assemblers
1312 = Aquaculture and fisheries production managers
4312 = Statistical, finance and insurance clerks
8312 = Railway brake, signal and switch operators
3512 = Information and communications technology user support technicians
7512 = Bakers, pastry-cooks and confectionery makers
8122 = Metal finishing, plating and coating machine operators
1222 = Advertising and public relations managers
6222 = Inland and coastal waters fishery workers
3422 = Sports coaches, instructors and officials
7422 = Information and communications technology installers and servicers
2622 = Librarians and related information professionals
2132 = Farming, forestry and fisheries advisers
3132 = Incinerator and water treatment plant operators
9332 = Drivers of animal-drawn vehicles and machinery
7532 = Garment and related pattern-makers and cutters
2632 = Sociologists, anthropologists and related professionals
3252 = Medical records and health information technicians
9703 = Social beneficiary (unemployed, retired, sickness, etc.)
6113 = Gardeners, horticultural and nursery growers
7113 = Stonemasons, stone cutters, splitters and carvers
8113 = Well drillers and borers and related workers
4413 = Coding, proof-reading and related clerks
7413 = Electrical line installers and repairers
3513 = Computer network and systems technicians
7223 = Metal working machine tool setters and operators
3423 = Fitness and recreation instructors and program leaders
7523 = Woodworking-machine tool setters and operators
9623 = Meter readers and vending-machine collectors
7233 = Agricultural and industrial machinery mechanics and repairers
2433 = Technical and medical sales professionals (excluding ICT)
2633 = Philosophers, historians and political scientists
8343 = Crane, hoist and related plant operators
7543 = Product graders and testers (excluding foods and beverages)
2643 = Translators, interpreters and other linguists
3153 = Aircraft pilots and related associate professionals
2263 = Environmental and occupational health and hygiene professionals
8183 = Packing, bottling and labelling machine operators
1114 = Senior officials of special-interest organizations
7114 = Concrete placers, concrete finishers and related workers
8114 = Cement, stone and other mineral products machine operators
3214 = Medical and dental prosthetic technicians
3314 = Statistical, mathematical and related associate professionals
7224 = Metal polishers, wheel grinders and tool sharpeners
1324 = Supply, distribution and related managers
2424 = Training and staff development professionals
3134 = Petroleum and natural gas refining plant operators
3334 = Real estate agents and property managers
2434 = Information and communications technology sales professionals
7544 = Fumigators and other pest and weed controllers
8154 = Bleaching, dyeing and fabric cleaning machine operators
2654 = Film, stage and related directors and producers
9705 = Vague(a good job, a quiet job, a well paid job, an office job)
7315 = Glass makers, cutters, grinders and finishers
3435 = Other artistic and cultural associate professionals
2635 = Social work and counselling professionals
3155 = Air traffic safety electronics technicians
8155 = Fur and leather preparing machine operators
7316 = Sign writers, decorative painters, engravers and etchers
7516 = Tobacco preparers and tobacco products makers
2146 = Mining engineers, metallurgists and related professionals
1346 = Financial and insurance services branch managers
8156 = Shoemaking and related machine operators
2656 = Announcers on radio, television and other media
7317 = Handicraft workers in wood, basketry and related materials
7127 = Air conditioning and refrigeration mechanics
3257 = Environmental and occupational health inspectors and associates
7318 = Handicraft workers in textile, leather and related materials
3119 = Physical and engineering science technicians not elsewhere classified
7119 = Building frame and related trades workers not elsewhere classified
1219 = Business services and administration managers not elsewhere classified
7319 = Handicraft workers not elsewhere classified
4419 = Clerical support workers not elsewhere classified
5419 = Protective services workers not elsewhere classified
2519 = Software and applications developers and analysts not elsewhere classified
2619 = Legal professionals not elsewhere classified
6129 = Animal producers not elsewhere classified
4229 = Client information workers not elsewhere classified
5329 = Personal care workers in health services not elsewhere classified
9329 = Manufacturing labourers not elsewhere classified
2529 = Database and network professionals not elsewhere classified
9629 = Elementary workers not elsewhere classified
3139 = Process control technicians not elsewhere classified
3339 = Business services agents not elsewhere classified
1439 = Services managers not elsewhere classified
2149 = Engineering professionals not elsewhere classified
1349 = Professional services managers not elsewhere classified
7549 = Craft and related workers not elsewhere classified
8159 = Textile, fur and leather products machine operators not elsewhere classified
3259 = Health associate professionals not elsewhere classified
2359 = Teaching professionals not elsewhere classified
3359 = Regulatory government associate professionals not elsewhere classified
2659 = Creative and performing artists not elsewhere classified
5169 = Personal services workers not elsewhere classified
2269 = Health professionals not elsewhere classified
8189 = Stationary plant and machine operators not elsewhere classified