OECD country
0 = Non-OECD
1 = OECD

Public or private
1 = Public
2 = Private
7 = N/A
8 = Invalid
9 = Miss

Funding - Government
9997 = N/A
9998 = Invalid
9999 = Miss

School Location
1 = Village
2 = Small Town
3 = Town
4 = City
5 = Large City
7 = N/A
8 = Invalid
9 = Miss

Competition between schools
1 = Two or More
2 = One Other
3 = No Others
7 = N/A
8 = Invalid
9 = Miss

Class size in <test language>
01 = 15 students or lower
02 = 16-20 students
03 = 21-25 students
04 = 26-30 students
05 = 31-35 students
06 = 36-40 students
07 = 41-45 students
97 = N/A
08 = 46-50 students
98 = Invalid
09 = More then 50 students
99 = Miss

Internet schoolwork - Lessons
1 = <10%
2 = 10-25%
3 = 26-50%
4 = 51-75%
5 = >75%
7 = N/A
8 = Invalid
9 = Miss

Shortage - Science teachers
1 = Not at all
2 = Very little
3 = To some extent
4 = A lot
7 = N/A
8 = Invalid
9 = Miss

Ability grouping - Similar content/different difficulty
1 = For all classes
2 = For some classes
3 = Not for any classes
7 = N/A
8 = Invalid
9 = Miss

Activities - Band
1 = Yes
2 = No
7 = N/A
8 = Invalid
9 = Miss

Purpose of additional math lessons
1 = Enrichment only
2 = Remedial only
3 = Both enrichment and remedial
4 = Without differentiation
7 = N/A
8 = Invalid
9 = Missing

Parental achievement pressure
1 = Many Parents
2 = Minority of Parents
3 = Largely absent
7 = N/A
8 = Invalid
9 = Miss

Teacher morale - High Morale
1 = Strongly agree
2 = Agree
3 = Disagree
4 = Strongly disagree
7 = N/A
8 = Invalid
9 = Miss

Teacher Appraisal - Salary change
1 = No change
2 = A small change
3 = A moderate change
4 = A large change
7 = N/A
8 = Invalid
9 = Miss

Admission - Academic record
1 = Never
2 = Sometimes
3 = Always
7 = N/A
8 = Invalid
9 = Miss

Responsibility - Hiring teachers - Principals
1 = Tick
2 = No tick
7 = N/A
8 = Invalid

School Leadership - Enhance reputation
1 = Did not occur
2 = 1-2 times during the year
3 = 3-4 times during the year
4 = Once a month
5 = Once a week
6 = More than once a week
7 = N/A
8 = Invalid
9 = Miss

Student Transfer - Low achievement
1 = Not likely
2 = Likely
3 = Very likely
7 = N/A
8 = Invalid
9 = Miss

Availability of FE
1 = Not available
2 = Available < 2 years
3 = Available > 2 years
7 = N/A
8 = Invalid
9 = Miss

Teaching FE - Separate subject
1 = Not at all
2 = 1-4 hours a year
3 = 5-19 hours year
4 = 20-49 hours a year
5 = 50 or more hours a year
7 = N/A
8 = Invalid
9 = Miss

Ability grouping for mathematics classes
1 = No ability grouping between any classes
2 = One of these forms of ability grouping between classes for some classes
3 = One of these forms of ability grouping for all classes
8 = Invaild
9 = Miss

Use of assessment
7 = N/A
8 = Invalid
9 = Miss

Class size
97 = N/A
98 = Invalid
99 = Miss

Mathematics extension course types offered
1 = Neither enrichment or remedial
2 = Either enrichment and remedial
3 = Both enrichment and remedial
7 = N/A
8 = Invalid
9 = Miss

Responsibility for curriculum and assessment
9999 = Miss

School Ownership
1 = Private Independent
2 = Private government-dependent
3 = Public
7 = N/A
8 = Invalid
9 = Miss

School selectivity/student admission policies
1 = Two factors are never considered
2 = At least one sometimes but neither always
3 = At least one always considered
9 = Miss

Total school enrolment
99997 = N/A
99998 = Invalid
99999 = Miss