My course was accepted by a previous SIGGRAPH conference. Doesn that mean it is good enough for acceptance by SIGGRAPH Asia 2008?
Repeat proposals are usually well written due to prior experience. However, this does not guarantee acceptance. The merits of each proposal are weighed relative to all submissions within a given year. Selection factors such as content improvement, industry relevance and currency, past attendee feedback, past attendance patterns, course materials, and overall program balance will influence repeat session priorities. The rationale section of your proposal should provide clear, compelling reasons for repeating a course. Repeat proposals should also state how they have addressed any issues identified in previous attendee feedback.