iTunes U courses listings out of order? Hegarty - Coding Together

Paul Hegarty's iTunes U course named "Coding Together - Apps for iPhone and iPad" lists its courses in a confusing order, it seems. (See image below). The number system is inconsistently applied and out of order, the dates are jumbled, etc.

How can I know what order to take the courses? (Believe me, I've tried to find the answer before posting this).