1 = Younger cohort
2 = Older cohort

Site numeric code
10 = Sintra
01 = Ottawa
11 = Suzhou
02 = Houston
03 = Bogota
04 = Manizales
06 = Helsinki
07 = Moscow
08 = Istanbul
09 = Daegu

School may appear more than one cohort
0 = No
1 = Yes

Test language 3-letter code-principal
SPA = Spanish
ITA = Italian
FRE = French
SWE = Swedish
ENG = English
CHI = Chinese
FIN = Finnish
KOR = Korean
TUR = Turkish
RUS = Russian
PRT = Portugese

Total time spent (minutes)-principal
999999 = Missing (missing end date)

Average class size
1 = 15 students or fewer
2 = 16-20 students
3 = 21-25 students
4 = 26-30 students
5 = 31-35 students
6 = 36-40 students
7 = 41-45 students
8 = 46-50 students
9 = More than 50 students
97 = N/A
98 = Missing by design
99 = Omitted

Student percent - [heritage language]
1 = Less than 5%
2 = 5-10%
3 = 11-25%
4 = 26-50%
5 = More than 50%
7 = N/A
8 = Missing by design
9 = Omitted

Time students at school per day
9997 = N/A
9998 = Missing by design
9999 = Omitted

School capacity hindered - lack of teaching staff
1 = Not at all
2 = Very little
3 = To some extent
4 = A lot
7 = N/A
8 = Missing by design
9 = Omitted

Teachers at school - 10 years or more
1 = Less than 10 %
2 = 11-25%
3 = 26-50%
4 = 51-75%
5 = More than 75%
7 = N/A
8 = Missing by design
9 = Omitted

Training on social and emotional skills inside school
1 = No
2 = Yes, a short training (few weeks)
3 = Yes, a training lasting in between a month and a year
4 = Yes, an extensive training or a programme lasing more than a year
7 = N/A
8 = Missing by design
9 = Omitted

Request to promote the development of students’ social and emotional skills
1 = No
2 = Yes
7 = N/A
8 = Missing by design
9 = Omitted

Evaluate students' achievement in social and emotional skills
1 = No, we don't evaluate these skills
2 = Yes, using informal evaluation
3 = Yes, using formal evaluation
7 = N/A
8 = Missing by design
9 = Omitted

Group students - by their performance
1 = Not for any subjects
2 = For some subjects
3 = For all subjects
7 = N/A
8 = Missing by design
9 = Omitted

Student participations - school activities
1 = Less than 10 %
2 = More than 10% but less then 25%
3 = More than 25% but less then 50%
4 = More than 50% but less then 75%
5 = More than 75% but less then 90%
6 = More than 90%
7 = N/A
8 = Missing by design
9 = Omitted

School aims - academic achievement areas
1 = Strongly disagree
2 = Disagree
3 = Neither agree nor disagree
4 = Agree
5 = Strongly agree
7 = N/A
8 = Missing by design
9 = Omitted

School's connection with community involvement by students and their families
1 = Community service is a required part of our curriculum
2 = The school organises community service activities
3 = The school supports or encourages community service activities
4 = The school supports or encourages our teachers to help
5 = Parent and student groups on their own are active in such activities
7 = N/A
8 = Missing by design
9 = Omitted

Curriculum - techniques to deal with stress
1 = Does not apply to our school
2 = Applies to our school
7 = N/A
8 = Missing by design
9 = Omitted

Student learning hindered - truancy
1 = Not all all
2 = Very little
3 = To some extent
4 = A lot
7 = N/A
8 = Missing by design
9 = Omitted

Parental expect school higher academic standards
1 = Constant pressure from many parents
2 = Pressure from a minority of parents
3 = Pressure from parents is largely absent
7 = N/A
8 = Missing by design
9 = Omitted

Admit students - student academic performance
1 = Never
2 = Sometimes
3 = Always
7 = N/A
8 = Missing by design
9 = Omitted

Satisfaction with terms of principal [contract/employment]
1 = Very satisfied
2 = Somewhat satisfied
3 = Neutral, neither satistifed nor dissatistifed
4 = Somewhat dissatistifed
5 = Very dissatistifed
7 = N/A
8 = Missing by design
9 = Omitted