When you take your reassessment is dependant on the course, not your programme. This means you may follow two patterns simultaneously.
For example, if you need to complete reassessments in both EC411 and GY426 you will take the assessments for EC411 accoring to the IRDAP pattern, and GY426 according to the standard RDAP1/RDAP2 pattern.
If you're on a 9 or 10 month programme you will complete your IRDAP assessments after receiving your results in July.
If you're on a 12 month programme then the IRDAP assessments will fall before you recieve your results in November. Visit IRDAP enabled postgraduate courses and 12 month programmes for more details of how this will work.
For more information about how the two patterns interact check out the scenarios at the bottom of this page.