Type of course
Green are land-based theory courses which can be taken intensively over a week or spread over a few weekends or evening classes. Solent Sail now offer some theory course through a new form of e-learning.
Blue are on-water practical courses.
Red are exams.

Progression
Although it is recommended that you attempt each course only after you have completed those above a particular level, this is not always essential. For example, you don't have to complete the 'Day Skipper Theory' course before moving to Day Skipper practical. The non-RYA courses are entirely optional and you could do them in any order.

Duration
Start Yachting and non RYA courses last a weekend, but other RYA practical courses are at least 5 days duration.

Organisation
RYA Courses generally run concurrently so that people of different abilities are on the same boat. This works well with for example Day Skippers and Competent Crew whose skills are complimentary to each other.
Non RYA courses are always separate.

Course completion
During each practical course you can expect to receive regular feedback from the instructor and then a final de-brief at the end. The overwhelming majority of candidates pass their course as our instructors' aim is to make sure this happens. And if you are weak on just a few areas, you can come back on a future course to spend a couple of days re assessing your abilities.