Country ID (ISO 3166, numeric)
36 = Australia
40 = Austria
56 = Belgium
124 = Canada
196 = Cyprus
203 = Czech Republic
208 = Denmark
233 = Estonia
246 = Finland
250 = France
276 = Germany
372 = Ireland
380 = Italy
392 = Japan
410 = Korea
528 = Netherlands
578 = Norway
616 = Poland
643 = Russian Federation
703 = Slovak Republic
724 = Spain
752 = Sweden
826 = United Kingdom
840 = United States
84091 = United States (16-74 y.o. sample)
84092 = United States (prison sample)
84093 = United States (2017, 16-74 y.o. sample)

Country ID and sub-national entity sample code (string)
FRA = France
USA = United States
ITA = Italy
NLD = Netherlands
SWE = Sweden
CZE = Czech Republic
DNK = Denmark
SVK = Slovak Republic
BEL = Flanders (Belgium)
POL = Poland
IRL = Ireland
CAN = Canada (French)
FIN = Finland
JPN = Japan
ESP = Spain
CYP = Cyprus
GBR = Northern Ireland (UK)
KOR = Korea
NOR = Norway
AUS = Australia
RUS = Russian Federation
EST = Estonia
AUT = Austria
DEU = Germany

Person resolved gender from BQ and QC check (derived)
1 = Male
2 = Female
9 = Not stated or inferred

Gender (Trend-IALS/ALL)
1 = Male
2 = Female
6 = Valid skip
7 = Don't know
8 = Refused
9 = Not stated or inferred

Education - Highest qualification - Level
1 = No formal qualification or below ISCED 1
2 = ISCED 1
3 = ISCED 2
4 = ISCED 3C shorter than 2 years
5 = ISCED 3C 2 years or more
6 = ISCED 3A-B
7 = ISCED 3 (without distinction A-B-C, 2y+)
8 = ISCED 4C
9 = ISCED 4A-B
10 = ISCED 4 (without distinction A-B-C)
11 = ISCED 5B
12 = ISCED 5A, bachelor degree
13 = ISCED 5A, master degree
14 = ISCED 6
15 = Foreign qualification
16 = ISCED 5A bachelor degree, 5A master degree, and 6 (without distinction)
96 = Valid skip
97 = Don't know
98 = Refused
99 = Not stated or inferred

Highest level of schooling (Trend-IALS/ALL)
1 = Less than high school
2 = High school
3 = Above high school
4 = Not definable
6 = Valid skip
8 = Don't know/Refused
9 = Not stated or inferred

Education - Highest qualification - Area of study
1 = General programmes
2 = Teacher training and education science
3 = Humanities, languages and arts
4 = Social sciences, business and law
5 = Science, mathematics and computing
6 = Engineering, manufacturing and construction
7 = Agriculture and veterinary
8 = Health and welfare
9 = Services
96 = Valid skip
97 = Don't know
98 = Refused
99 = Not stated or inferred

Education - Time elapsed since finished highest qualification (categorised, 5 categories)
1 = less than 1 year
2 = 1 to less than 2 years
3 = 2 to less than 5 years
4 = 5 to less than 10 years
5 = 10 years or more
6 = Valid skip
7 = Don't know
8 = Refused
9 = Not stated or inferred

Education - Current qualification
1 = Yes
2 = No
6 = Valid skip
7 = Don't know
8 = Refused
9 = Not stated or inferred

Education - Derived Months elapsed since leaving education without completing program (categorized, 3 categories)
1 = less than 1 year
2 = 1 to less than 2 years
3 = 2 years or more
6 = Valid skip
7 = Don't know
8 = Refused
9 = Not stated or inferred

Education - Formal qualification - Count (top-coded at 2)
6 = Valid skip
7 = Don't know
8 = Refused
9 = Not stated or inferred

Education - Formal qualification - Employed - Working hours
1 = Only during working hours
2 = Mostly during working hours
3 = Mostly outside working hours
4 = Only outside working hours
6 = Valid skip
7 = Don't know
8 = Refused
9 = Not stated or inferred

Education - Formal qualification - Employed - Useful for job
1 = Not useful at all
2 = Somewhat useful
3 = Moderately useful
4 = Very useful
6 = Valid skip
7 = Don't know
8 = Refused
9 = Not stated or inferred

Education - Formal qualification - Grant from employer
1 = Yes, totally
2 = Yes, partly
3 = No, not at all
4 = There were no such costs
5 = No employer or prospective employer at that time
6 = Valid skip
7 = Don't know
8 = Refused
9 = Not stated or inferred

Activities - Last year - Number of learning activities (DERIVED BY CAPI)
1 = Respondent reported 1 learning activity
2 = Respondent reported more than 1 learning activity
3 = Respondent reported no learning activities
4 = Respondent reported learning activities but number is not known
5 = Information on learning activities is not known
6 = Valid skip
7 = Don't know
8 = Refused
9 = Not stated or inferred

Activities - Last year - Activity specified
1 = A course conducted through open or distance education
2 = An organised session for on-the-job training or training by supervisors or co-workers
3 = A seminar or workshop
4 = Other kind of course or private lesson
6 = Valid skip
7 = Don't know
8 = Refused
9 = Not stated or inferred

Activities - Last year - Reason for participating
1 = To do my job better and/or improve career prospects
2 = To be less likely to lose my job
3 = To increase my possibilities of getting a job, or changing a job or profession
4 = To start my own business
5 = I was obliged to participate
6 = To increase my knowledge or skills on a subject that interests me
7 = To obtain a certificate
8 = Other
96 = Valid skip
97 = Don't know
98 = Refused
99 = Not stated or inferred

Activities - Last year - Time spend - Unit
1 = Weeks
2 = Days
3 = Hours
6 = Valid skip
7 = Don't know
8 = Refused
9 = Not stated or inferred

Activities - Last year - Time spend for activities - Weeks
96 = Valid skip
97 = Don't know
98 = Refused
99 = Not stated or inferred

Activities - Last year - Time spend for activities - Days
996 = Valid skip
997 = Don't know
998 = Refused
999 = Not stated or inferred

Activities - Last year - Time spend for activities - Hours
9996 = Valid skip
9997 = Don't know
9998 = Refused
9999 = Not stated or inferred

Activities - Last year - Time spend for activities - Proportion of job-related hours
1 = None of the time
2 = Up to a quarter of the time
3 = Up to half of the time
4 = More than half of the time
5 = All of the time
6 = Valid skip
7 = Don't know
8 = Refused
9 = Not stated or inferred

Training or education for career or job wanted but not taken in last 12 months (Trend-IALS/ALL)
1 = Yes
2 = No
6 = Valid skip
8 = Don't know/Refused
9 = Not stated or inferred

Activities - Last year - Wanted but didn't start - Reason
1 = I did not have the prerequisites
2 = Education or training was too expensive/I could not afford it
3 = Lack of employer's support
4 = I was too busy at work
5 = The course or programme was offered at an inconvenient time or place
6 = I did not have time because of child care or family responsibilities
7 = Something unexpected came up that prevented me from taking education or training
8 = Other
96 = Valid skip
97 = Don't know
98 = Refused
99 = Not stated or inferred

Current status/work history - Last month - Reason not looking for work - Waiting for result of application
1 = Marked
2 = Not marked
6 = Valid skip
7 = Don't know
8 = Refused
9 = Not stated or inferred

Current status/work history - Last month - Active steps to find job (DERIVED BY CAPI)
1 = Yes
2 = No
3 = Not known
6 = Valid skip
7 = Don't know
8 = Refused
9 = Not stated or inferred

Current status/work history - Employment status (DERIVED BY CAPI)
1 = Employed
2 = Unemployed
3 = Out of the labour force
4 = Not known
6 = Valid skip
7 = Don't know
8 = Refused
9 = Not stated or inferred

Current status/work history - Last week - Number of jobs
1 = One job or business
2 = More than one job or business
6 = Valid skip
7 = Don't know
8 = Refused
9 = Not stated or inferred

Current status/work history - Current - Paid job or family business (DERIVED BY CAPI)
1 = Yes, paid work one job or business
2 = Yes, paid work more than one job or business or number of jobs/businesses missing
3 = Yes, unpaid work for family business
4 = No
5 = Not known
6 = Valid skip
7 = Don't know
8 = Refused
9 = Not stated or inferred

Current status/work history - Subjective status
1 = Full-time employed (self-employed, employee)
2 = Part-time employed (self-employed, employee)
3 = Unemployed
4 = Pupil, student
5 = Apprentice, internship
6 = In retirement or early retirement
7 = Permanently disabled
8 = In compulsory military or community service
9 = Fulfilling domestic tasks or looking after children/family
10 = Other
96 = Valid skip
97 = Don't know
98 = Refused
99 = Not stated or inferred

Current work situation (Trend-IALS/ALL)
1 = Employed or self employed
2 = Retired
3 = Not working and looking for work
4 = Student (including work programs)
5 = Doing unpaid household work
6 = Other
96 = Valid skip
98 = Don't know/Refused
99 = Not stated or inferred

Current status/work history - Left work in past 5 years (DERIVED BY CAPI)
1 = Yes
2 = No or unknown
6 = Valid skip
7 = Don't know
8 = Refused
9 = Not stated or inferred

Current status/work history - Work experience (DERIVED BY CAPI)
1 = Currently working (paid or unpaid)
2 = Recent work experience in last 12 months
3 = Left paid work longer than 12 months ago
4 = No work experience
5 = Status unknown
6 = Valid skip
7 = Don't know
8 = Refused
9 = Not stated or inferred

Current work - Economic sector
1 = The private sector (for example a company)
2 = The public sector (for example the local government or a state school)
3 = A non-profit organisation (for example a charity, professional association or religious organisation)
6 = Valid skip
7 = Don't know
8 = Refused
9 = Not stated or inferred

Current work - Employee or self-employed
1 = Employee
2 = Self-employed
6 = Valid skip
7 = Don't know
8 = Refused
9 = Not stated or inferred

Status at this job or business - six levels (Trend-IALS/ALL)
1 = Employee, not supervisor
2 = Employee, supervising fewer than 5 people
3 = Employee, supervising more than 5 people
4 = Self-employed, not supervisor
5 = Self-employed, supervisor
6 = Unpaid family worker
96 = Valid skip
98 = Don't know/Refused
99 = Not stated or inferred

Status at this job or business - four levels (Trend-IALS/ALL)
1 = Employee, not supervisor
2 = Employee, supervising fewer than 5 people
3 = Employee, supervising more than 5 people
4 = Self-employed or unpaid family worker
6 = Valid skip
8 = Don't know/Refused
9 = Not stated or inferred

Current work - Amount of people working for employer
1 = 1 to 10 people
2 = 11 to 50 people
3 = 51 to 250 people
4 = 251 to 1000 people
5 = More than 1000 people
6 = Valid skip
7 = Don't know
8 = Refused
9 = Not stated or inferred

Current work - Amount of people working for employer increased
1 = Increased
2 = Decreased
3 = Stayed more or less the same
6 = Valid skip
7 = Don't know
8 = Refused
9 = Not stated or inferred

Current work - Employees working for you - Count (collapsed, 2 categories)
1 = 1 to 10 people
2 = more than 10 people
6 = Valid skip
7 = Don't know
8 = Refused
9 = Not stated or inferred

Current work - Managing other employees - Count
1 = 1 to 5 people
2 = 6 to 10 people
3 = 11 to 24 people
4 = 25 to 99 people
5 = 100 or more people
6 = Valid skip
7 = Don't know
8 = Refused
9 = Not stated or inferred

Hours per week at this job or business - Number of hours (topcoded at 97, Trend-IALS/ALL)
996 = Valid skip
998 = Don't know/Refused
999 = Not stated or inferred

Hours per week at this job or business - range of hours (Trend-IALS/ALL)
1 = 0 - 20 hours
2 = 21 - 40 hours
3 = 41 - 60 hours
4 = 61 - 80 hours
5 = 81 - 100 hours
6 = More than 100 hours
96 = Valid skip
98 = Don't know/Refused
99 = Not stated or inferred

Current work - Work flexibility - Sequence of tasks
1 = Not at all
2 = Very little
3 = To some extent
4 = To a high extent
5 = To a very high extent
6 = Valid skip
7 = Don't know
8 = Refused
9 = Not stated or inferred

Current work - Requirements - Education level
1 = No formal qualification or below ISCED 1
2 = ISCED 1
3 = ISCED 2
4 = ISCED 3C shorter than 2 years
5 = ISCED 3C 2 years or more
6 = ISCED 3A-B
7 = ISCED 3 (without distinction A-B-C, 2y+)
8 = ISCED 4C
9 = ISCED 4A-B
10 = ISCED 4 (without distinction A-B-C)
11 = ISCED 5B
12 = ISCED 5A, bachelor degree
13 = ISCED 5A, master degree
14 = ISCED 6
15 = ISCED 5A bachelor degree, 5A master degree, and 6 (without distinction)
96 = Valid skip
97 = Don't know
98 = Refused
99 = Not stated or inferred

Current work - Requirements - To do the job satisfactorily
1 = This level is necessary
2 = A lower level would be sufficient
3 = A higher level would be needed
6 = Valid skip
7 = Don't know
8 = Refused
9 = Not stated or inferred

Current work - Requirements - Related work experience
1 = None
2 = Less than 1 month
3 = 1 to 6 months
4 = 7 to 11 months
5 = 1 or 2 years
6 = 3 years or more
96 = Valid skip
97 = Don't know
98 = Refused
99 = Not stated or inferred

Current work - Learning - Learning from co-workers/supervisors
1 = Never
2 = Less than once a month
3 = Less than once a week but at least once a month
4 = At least once a week but not every day
5 = Every day
6 = Valid skip
7 = Don't know
8 = Refused
9 = Not stated or inferred

Current work - Job satisfaction
1 = Extremely satisfied
2 = Satisfied
3 = Neither satisfied nor dissatisfied
4 = Dissatisfied
5 = Extremely dissatisfied
6 = Valid skip
7 = Don't know
8 = Refused
9 = Not stated or inferred

Current work - Earnings - Salary interval
1 = Per hour
2 = Per day
3 = Per week
4 = Per two weeks
5 = Per month
6 = Per year
7 = Piece rate
8 = I get no salary or wage at all
96 = Valid skip
97 = Don't know
98 = Refused
99 = Not stated or inferred

Annual net income before taxes and deductions (Trend-IALS/ALL)
0 = No income
1 = Lowest quintile
2 = Next lowest quintile
3 = Mid-level quintile
4 = Next to highest quintile
5 = Highest quintile
6 = Valid skip
7 = Don't know
8 = Refused
9 = Not stated or inferred

Last job - Reason for end of job
1 = I was dismissed
2 = I was made redundant or took voluntary redundancy
3 = It was a temporary job which came to an end
4 = I resigned
5 = I gave up work for health reasons
6 = I took early retirement
7 = I retired (at or after State Pension age)
8 = I gave up work because of family responsibilities or child care
9 = I gave up work in order to study
10 = I left for some other reason
96 = Valid skip
97 = Don't know
98 = Refused
99 = Not stated or inferred

As part of job, read or use directions or instructions (Trend-IALS/ALL)
1 = At least once a week
2 = Less than once a week
3 = Rarely
4 = Never
6 = Valid skip
8 = Don't know/Refused
9 = Not stated or inferred

Skill use work - ICT - Computer - Level of computer use
1 = Straightforward
2 = Moderate
3 = Complex
6 = Valid skip
7 = Don't know
8 = Refused
9 = Not stated or inferred

In daily life, read or use letters, notes, e-mails (Trend-IALS/ALL)
1 = At least once a week
2 = Less than once a week but at least once a month
3 = Rarely
4 = Never
6 = Valid skip
7 = Don't know
8 = Refused
9 = Not stated or inferred

About yourself - Political efficacy - No influence on the government
1 = Strongly agree
2 = Agree
3 = Neither agree nor disagree
4 = Disagree
5 = Strongly disagree
6 = Valid skip
7 = Don't know
8 = Refused
9 = Not stated or inferred

About yourself - Health - State
1 = Excellent
2 = Very good
3 = Good
4 = Fair
5 = Poor
6 = Valid skip
7 = Don't know
8 = Refused
9 = Not stated or inferred

Number living in household (from 1 to 7) (Trend-IALS/ALL)
1 = One person in the household
2 = Two persons in the household
3 = Three persons in the household
4 = Four persons in the household
5 = Five persons in the household
6 = Six persons in the household
7 = Seven persons or more in the household
96 = Valid skip
98 = Don't know/Refused
99 = Not stated or inferred

Background - Age of the child (categorised, 4 categories)
1 = Aged 2 or younger
2 = Aged 3-5
3 = Aged 6-12
4 = Aged 13 or older
6 = Valid skip
7 = Don't know
8 = Refused
9 = Not stated or inferred

Mother or female guardian born in country (Trend-IALS/ALL)
1 = Yes
2 = No
3 = Not applicable
6 = Valid skip
7 = Don't know
8 = Refused
9 = Not stated or inferred

Background - Mother/female guardian - Highest level of education
1 = ISCED 1, 2, and 3C short
2 = ISCED 3 (excluding 3C short) and 4
3 = ISCED 5 and 6
6 = Valid skip
7 = Don't know
8 = Refused
9 = Not stated or inferred

Highest level of education - mother or female guardian (Trend-IALS/ALL)
1 = ISCED 1, 2, and 3C short
2 = ISCED 3 (excluding 3C short) and 4
3 = ISCED 5 and 6
4 = Not definable
6 = Valid skip
7 = Don't know
8 = Refused
9 = Not stated or inferred

Background - Number of books at home
1 = 10 books or less
2 = 11 to 25 books
3 = 26 to 100 books
4 = 101 to 200 books
5 = 201 to 500 books
6 = More than 500 books
96 = Valid skip
97 = Don't know
98 = Refused
99 = Not stated or inferred

Educational level of the respondent (DERIVED BY CAPI)
1 = Low
2 = Medium
3 = High
9 = Not stated or inferred

Final disposition code for BQ/JRA
0 = Not assigned
1 = Complete
3 = Partial complete/breakoff
4 = Refusal - Sample person
5 = Refusal - Other
7 = Language problem
8 = Reading and writing difficulty
9 = Learning/mental disability
12 = Hearing impairment
13 = Blindness/visual impairment
14 = Speech impairment
15 = Physical disability
16 = Other disability
17 = Other (unspecified), such as sickness or unusual circumstances
18 = Death
21 = Maximum number of calls
24 = Temporarily absent/unavailable during field period
25 = Ineligible
27 = Duplication - already interviewed
90 = Technical problem
99 = Not stated or inferred

Language for exercise
1 = English
2 = German
3 = Dutch
4 = Spanish
5 = French
6 = Greek
7 = Czech
8 = Danish
9 = Estonian
10 = Russian
11 = Finnish
12 = Swedish
13 = German
14 = Hungarian
15 = Italian
16 = Japanese
17 = Korean
18 = Dutch
19 = Norwegian (BokmÃ¥l)
20 = Polish
21 = Portuguese
22 = Russian
23 = Slovak
24 = Slovenian
25 = Basque
26 = Catalan
27 = Spanish
28 = Galician
29 = Valencian
30 = Swedish
31 = Welsh
99 = Not stated or inferred

Paper branch (derived)
0 = Missing
1 = PP1-LIT
2 = PP2-NUM
3 = Failed Paper Core
9 = Not stated or inferred

CBA module 1 branch (derived)
0 = Missing
1 = LIT
2 = NUM
3 = PS1
9 = Not stated or inferred

CBA module 2 branch (derived)
0 = Missing
1 = LIT
2 = NUM
3 = PS2
9 = Not stated or inferred

Paper-based routing code (derived)
1 = No computer experience
2 = Failed ICT Core stage 1
3 = Refused CBA
4 = Took CBA
5 = Uncategorized
9 = Not stated or inferred

Observation module: Presence of additional person
1 = Yes
2 = No
9 = Not stated or inferred

Observation module: Respondent understood the questions
1 = Never
2 = Almost never
3 = Now and then
4 = Often
5 = Very Often
9 = Not stated or inferred

Observation module: Room of assessment
1 = Living/dining room
2 = Kitchen
3 = Bedroom
4 = Entrance
5 = Hallway or corridor
6 = Office
7 = Other space in the household
8 = Other space outside of the household
99 = Not stated or inferred

Respondent's highest level of education obtained is vocationally oriented (derived, ISCED3 and 4 only)
0 = False
1 = True
6 = Valid skip
7 = Don't know
8 = Refused
9 = Not stated or inferred

Highest of mother or father's level of education (derived)
1 = Neither parent has attained upper secondary
2 = At least one parent has attained secondary and post-secondary, non-tertiary
3 = At least one parent has attained tertiary
6 = Valid skip
7 = Don't know
8 = Refused
9 = Not stated or inferred

Interactions between place of birth and language status (derived)
1 = Native-born and native-language
2 = Native-born and foreign-language
3 = Foreign-born and native-language
4 = Foreign-born and foreign-language
6 = Valid skip
7 = Don't know
8 = Refused
9 = Not stated or inferred

Test language same as language spoken most often at home (derived)
0 = Test language not same as home language
1 = Test language same as home language
6 = Valid skip
7 = Don't know
8 = Refused
9 = Not stated or inferred

Country region (9 regions)
1 = Arab States
2 = South and West Asia
3 = Latin America and the Caribbean
4 = Sub-Saharan Africa
5 = East Asia and the Pacific (poorer countries)
6 = Central Asia
7 = East Asia and the Pacific (richer countries)
8 = Central and Eastern Europe
9 = North America and Western Europe
99 = Not stated or inferred

Parents' immigration status (derived)
1 = Both parents foreign-born
2 = One parent foreign-born
3 = Both parents native-born
9 = Not stated or inferred

First and second generation immigrants (derived)
1 = 1st generation immigrants
2 = 2nd generation immigrants
3 = Non 1st or 2nd generation immigrants
4 = Non-immigrant and one foreign-born parent
9 = Not stated or inferred

Years in country (categorised, 4 categories)
1 = 0-5 years
2 = 6-10 years
3 = 11-15 years
4 = more than 15 years
94 = Native born
99 = Not stated or inferred

Years in country (2-category - derived)
1 = In host country 5 or fewer years
2 = In host country more than 5 years
3 = Non-immigrants
9 = Not stated or inferred

Highest level of formal education obtained (8 categories - derived)
1 = Primary or less (ISCED 1 or less)
2 = Lower secondary (ISCED 2, ISCED 3C short)
3 = Upper secondary (ISCED 3A-B, C long)
4 = Post-secondary, non-tertiary (ISCED 4A-B-C)
5 = Tertiary - professional degree (ISCED 5B)
6 = Tertiary - bachelor degree (ISCED 5A)
7 = Tertiary - master degree (ISCED 5A)
8 = Tertiary - research degree (ISCED 6)
9 = Tertiary - bachelor/master/research degree (ISCED 5A/6)
99 = Not stated or inferred

Highest level of formal education obtained (7 categories - derived)
1 = Primary or less (ISCED 1 or less)
2 = Lower secondary (ISCED 2, ISCED 3C short)
3 = Upper secondary (ISCED 3A-B, C long)
4 = Post-secondary, non-tertiary (ISCED 4A-B-C)
5 = Tertiary - professional degree (ISCED 5B)
6 = Tertiary - bachelor degree (ISCED 5A)
7 = Tertiary - master/research degree (ISCED 5A/6)
8 = Tertiary - bachelor/master/research degree (ISCED 5A/6)
99 = Not stated or inferred

Highest level of formal education obtained (6 categories - derived)
1 = Lower secondary or less (ISCED 1,2, 3C short or less)
2 = Upper secondary (ISCED 3A-B, C long)
3 = Post-secondary, non-tertiary (ISCED 4A-B-C)
4 = Tertiary - professional degree (ISCED 5B)
5 = Tertiary - bachelor degree (ISCED 5A)
6 = Tertiary - master/research degree (ISCED 5A/6)
7 = Tertiary - bachelor/master/research degree (ISCED 5A/6)
99 = Not stated or inferred

Participated in formal education in 12 months preceding survey (derived)
0 = Did not participate in FE
1 = Participated in FE
6 = Valid skip
7 = Don't know
8 = Refused
9 = Not stated or inferred

Adult education/training population (AET) - excludes youths 16-24 in initial cycle of studies (derived)
0 = Excluded from AET population
1 = AET population
9 = Not stated or inferred

Participated in formal AET in 12 months preceding survey (see AETPOP - derived)
0 = Did not participate in formal AET
1 = Participated in formal AET
4 = Student in regular cycle of studies
6 = Valid skip
7 = Don't know
8 = Refused
9 = Not stated or inferred

Participated in formal AET for job-related reasons in 12 months preceding survey (see AETPOP - derived)
0 = Did not participate in formal AET for JR reasons
1 = Participated in formal AET for JR reasons
4 = Student in regular cycle of studies
5 = Unknown
9 = Not stated or inferred

Participated in non-formal education in 12 months preceding survey (derived)
0 = Did not participate in NFE
1 = Participated in NFE
5 = Unknown
6 = Valid skip
7 = Don't know
8 = Refused
9 = Not stated or inferred

Participated in non-formal education for job-related reasons in 12 months preceding survey (derived)
0 = Did not participate in NFE for JR reasons
1 = Participated in NFE for JR reasons
5 = Unknown
9 = Not stated or inferred

Participated in non-formal education for non job-related reasons in 12 months preceding survey (derived)
0 = Did not participate in NFE for NJR reasons
1 = Participated in NFE for NJR reasons
5 = Unknown
9 = Not stated or inferred

Participated in formal or non-formal AET in 12 months preceding survey (see AETPOP - derived)
0 = Did not participate in formal or non-formal AET
1 = Participated in formal and/or non-formal AET
4 = Student in regular cycle of studies
5 = Unknown
9 = Not stated or inferred

Participated in formal or non-formal education for job-related reasons in 12 months preceding the survey (derived)
0 = Did not participate in FE or NFE for JR reasons
1 = Participated in FE or NFE for JR reasons
4 = Student in regular cycle of studies
5 = Unknown
9 = Not stated or inferred

Interaction between adults' work and education status (derived)
1 = In education only
2 = In education and work
3 = In work only
4 = Not in education or work but has participated in education or training in last 12 months
5 = Not in education or work and has not participated in education or training in last 12 months (NEET)
95 = Unknown
99 = Not stated or inferred

Adults not employed at time of survey and not in education or training in 12 months preceding the survey (derived)
0 = Employed or participated in education or training in last 12 months
1 = Not currently employed and did not participate in education or training in last 12 months (NEET)
5 = Unknown
9 = Not stated or inferred

Number of hours of participation in non-formal education for job-related reasons (derived)
9994 = Did not participate
9999 = Not stated or inferred

CLC / 301 - SGIH (Scored Response)
0 = No response
1 = Correct response
7 = Incorrect response
9 = Not reached/Not attempted

CLC / 301 - SGIH (Timing)
99999999 = Not reached/Not attempted

CLC / 301 - SGIH (Number of Actions)
9999 = Not reached/Not attempted

Problem-solving Unit 01a (Polytomous scored response - derived)
0 = Incorrect
1 = Partial 1
2 = Partial 2
3 = Correct
8 = No response
9 = Not reached/Not attempted

Problem-solving Unit 01b (Dichotomous scored response - derived)
0 = Missing
1 = Correct
7 = Incorrect
9 = Not reached/Not attempted

Problem-solving Unit 19b (Polytomous scored response - derived)
0 = Incorrect
1 = Partial
2 = Correct
8 = No response
9 = Not reached/Not attempted

PL / 317 - Q14 - Apples - Occupation (Scored Response)
0 = Question refused / not done
1 = Correct response 1
2 = Correct response 2
7 = Any other response
9 = Not reached/Not attempted

PV Q1 square (Actual Response)
0 = Question refused / not done
1 = Response 1 (first word choice)
2 = Response 2 (second word choice)
3 = Response 3 (third word choice)
4 = Response 4 (fourth word choice)
7 = Any other response
9 = Not reached/Not attempted

PV Q1 square (Scored Response)
0 = Question refused / not done
1 = Correct response
7 = Incorrect response
8 = Any other response
9 = Not reached/Not attempted

SP S1 (Actual Response)
0 = Question refused / not done
1 = Response 1 (yes)
2 = Response 2 (no)
7 = Any other response
9 = Not reached/Not attempted

PC P1 S2 The Birthday Party (Actual Response)
0 = Question refused / not done
1 = Response 1 (first word choice)
2 = Response 2 (second word choice)
7 = Any other response
9 = Not reached/Not attempted

PIAAC Sample Indicator
0 = Out-of-international-sample
1 = In-international-sample

Background - Mother/female guardian - Highest level of education
1 = Less than high school diploma
2 = High school diploma/some college but no degree
3 = College degree or higher (Associate, Bachelor, Doctorate)
6 = Valid skip
7 = Don't know
8 = Refused
9 = Not stated or inferred

Background - Household Income
1 = Between $1 and $9,999
2 = Between $10,000 and $19,999
3 = Between $20,000 and $29,999
4 = Between $30,000 and $39,999
5 = Between $40,000 and $49,999
6 = Between $50,000 and $59,999
7 = Between $60,000 and 74,999
8 = Between $75,000 and $99,999
9 = Between $100,000 and $149,999
10 = $150,000 or more
11 = No household income
96 = Valid skip
97 = Don't know
98 = Refused
99 = Not stated or inferred

Education - highest qualification - level (3 categories) (derived from B_Q01a)
1 = ISCED 2 and below
2 = ISCED 3 and 4a-b
3 = ISCED 5a-b and 6
6 = Valid skip
7 = Don't know
8 = Refused
9 = Not stated or inferred

Background - English language status (derived)
1 = Learned English as the first language
2 = Learned English when age 15 or younger
3 = Learned English when age 16 or older
9 = Not stated or inferred

Flag for ages 16-34
0 = 35 - 74 years old
1 = 16 - 34 years old

Flag for ages 66-74
0 = 16 - 65 years old
1 = 66 - 74 years old

Flag for international comparison
0 = Other
1 = Household sample 16 - 65 years old

Employment status (derived, 6 categories)
1 = Employed and work 35+ hours per week
2 = Employed and work 15-34 hours per week
3 = Employed and work 1-14 hours per week
4 = Employed and unknown work hours
5 = Unemployed
6 = Out of labor force
9 = Not stated or inferred

Index of use of ICT skills at home (derived)
9996 = Valid skip
9999 = All zero response

Earnings including bonuses reporting method (derived)
1 = Reported directly
2 = Earnings and/or bonuses imputed
6 = Valid skip
9 = Neither reported nor imputed

Employment and student status (derived, 5 categories)
1 = Student (part-time employed, unemployed or out of labor force)
2 = Full-time employed (student or non-student)
3 = Part-time employed (non-student)
4 = Unemployed (non-student)
5 = Out of Labor Force (non-student)
9 = Not stated or inferred