Carl Davidson found Learning Ladders:

• Moderately improves attainment“The system makes it very easy to see prior learning and assessments so lessons can be pitched accordingly for each child, ensuring there is appropriate challenge for all.”
• Moderately reduces attainment gap“The presentation of the data makes it clear to see the differences between groups in a class and also between each of the classes in the school. This helps to develop class and whole school focuses to address gaps in understanding.”
• Slightly saves school money