In my previous post I set out a view of the relationship between the interaction order and social structure. I want now to discuss the forms of integration or malintegration that exist at each level. These issues were famously discussed by David Lockwood in an article of 1964 through his distinction between ‘social integration’ and ‘system integration’ (in Explorations in Social Change , edited by Zollschan and Hirsch). My claim is that social integration should be seen as relating to the interaction order and system integration as relating to the macro-level social structure. A state of social integration exists when interacting individuals and groups establish shared understandings that permit a coordination of their actions. They produce a negotiated order that underpins their joint action. Where there are failures in mutual understanding and a resulting lack of coordination, there is social disorder, rather than social order, and the potential for social disintegration. This was