The assessment for GCSEs is organised into units which can either all be taken at the end of the course in a linear fashion, or used to complement a more unitised approach to teaching and learning. This gives you the flexibility to choose the assessment approach best suited to your centre and your students.
A unitised structure gives you the flexibility to co-teach short and full courses.
We already offer assessments which are organised into units at A Level and for some legacy GCSEs. For many subjects, assessments will be available twice a year. Flexible assessment means:
To ensure that the assessment supports the coherence of the GCSEs and there is no over-assessment, QCA has put two rules in place: 40% of the assessment must happen at the end of the course and only one re-sit of each assessment unit is allowed.
You may know 'unitised' as 'modular'.

Access teacher and student resources information for GCSEs (from 2009).