Recommendations for Hart Banach

1. I don't think it's a good idea to hold several programmes concurrently or spaced closely in time. Otherwise, since the proportion of vulnerable students is (presumably) small, it will mean that students may be engaged in different activities at almost the same time, and it will be difficult to gauge which one actually contributed to the variables we are planning to use.

2. Getting more schools involved seems to be a necessity. There might be some school-specific effects that one will not be able to differentiate from the true experimental effect if only one school is considered. This will still not eliminate teacher effect though. How about treating that as a random effect?