I am pleased to say that John Biggs himself has endorsed this representation of his ideas; "I've just found your website on SOLO et al. via google. I'm delighted! Your diagrams of prestructural-extended abstract are very elegant..." (Unsolicited email, 29 May 2005) The SOLO taxonomy stands for: Structure of Observed Learning Outcomes It describes level of increasing complexity in a student's understanding of a subject, through five stages, and it is claimed to be applicable to any subject area. I confess to a slight distrust of this kind of "progressive" model, which aspires inexorably to a final state. However, the emerging field of work on Threshold Concepts and Troublesome Knowledge links in very effectively with the SOLO taxonomy and offers some points about how the above issues might be addressed. There is a small but enthusiastic group of teachers using the SOLO taxonomy to structure their teaching in schools, and blogging about it.
Related: Solo Taxonomy