@srpearce Maybe I can clear this up. @Lyla-Fischer is right; you cannot specify arbitrary order of assessment modules (such as self --> peer) 
There are specific orders that are supported (others will fail validation)
# peer
# self
# peer --> self
# training --> peer
# training --> self
# training --> peer --> self

Assessments will run in the order listed, so long as they are one of these specific combinations.