four forms of knowing—
experiential
presentational
propositional and
practical
(Heron, 1996; Heron & Reason, 2001).
http://people.bath.ac.uk/mnspwr/Papers/ActionResearch&OrganizationDevelopment.pdf
The Acton Research "Bible": http://www.amazon.com/SAGE-Handbook-Action-Research-Participative/dp/1412920299/ref=sr_1_1?ie=UTF8&s=books&qid=1254905701&sr=1-1#reader
