Based on Yrjö Engeström's Activity System Model, I added the concept "Resouce" to explore a new possibility.
Chained Activity Systems [Activity Theory]
In order to discuss the relationship between learning activity and other types of human activities, Engeström used a new term called Activity Network.
The Evolution of Activity [Activity Theory]
Engeström tracked back human activity to the animal form of activity. He said, “A central tenet embedded in this model is the immediately collective and populational character of animal activity and species development (see Jensen 1981).”