A unit applies to CST™ Advantage Plan and other CST Group Plans It represents your child’s proportionate share of the Education Assistance Payment (EAP) account. The number of units you have in your plan depends on how much, how often and for how many years you contribute. We use units because it's an easy way for us to tell you exactly how much you get when it's time to collect your EAPs. There is no pre-set EAP value for each unit, as it depends on the value of the EAP account in the year that your beneficiary is expected to start their post-secondary education and the number of units that are held by other children that are expected to be enrolled in the first year of their post-secondary studies in the same year.