Criteria used to select schools
| Criteria | Defined by |
|---|---|
| Type of school | Independent (fee paying), grammar (exam entry), comprehensive (open-access) |
| Socioeconomic profile of school | Percentage of pupils with free school meals |
| Intake profile of school | Ethnicity, gender and percentage of pupils with English as a second language |
| Geographic location of school | North, east, south and west Birmingham, UK |