Subject Progress Index (SPI) and Progress 8 figures differ because the calculations used are different, as outlined in the table below:
| Subject Progress Index (SPI) | Progress 8 (P8) |
|
SPI takes into account students who have a KS2 Prior above 0 AND a grade uploaded for the specific qualification. |
Progress 8 takes into account all students with a KS2 Prior above 0 (regardless of whether they have a grade or not). |
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SPI averages are based on Sisra schools who opted in to the specific Data Collaboration event (1,594 schools were opted in to the 2024 Data Collaboration). |
Official Progress 8 figures include all schools who report to the DfE. |
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Separate SPI figures are calculated for English Language and English Literature. |
English P8 is based on either the higher grade of Lang or Lit (there aren’t separate P8 values for Language and Literature). |
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Students taking only one of English Language or English Literature wouldn’t affect the SPI score for the other qualification. |
If a student has only taken English Language or English Literature then their grade wouldn’t be double weighted – therefore having a negative impact on English P8. |
Use these figures independently of one another, for example, SPI can be used to compare the performance and progress of individual qualifications against one another.
Updated