This is a summary from a web dedicated to autopoiesis

The observed phenomena, how the theory come about

the object is living systems, and living systems seen to constitute:
1. circularity in form and structure (emphasise components that make up a system)
2. circularity in internal operations (emphasise the identity and unity, ie. maintain system's contistutional and configurational integrity), that can be influence by environmental events but stand specific to that system.

essential circularity listed as follows:
1. repetition in the course of system actions or responses (system capacity to response limited to its circularities in form, configuration and internal operations)
2.