The CASE intervention
This was the reason that the CASE lessons were developed as an intervention in early secondary years to try to bridge this demand and readiness gap. The thirty lessons were spread over the first two years of secondary school. A lesson would be taken every two weeks throughout these years.

Each lesson has a low cognitive demand to allow access for all learners and then operates at a level that tends to increase over the two years. Each lesson also has cognitively challenging activities that stretch all of the class. Notice that as a new schemata is introduced the starting level tends to drop down a little. Over the two years the schemata become more complex. The overall intention is not to master these schemata but prepare the growing mind for new learning.