The SET Framework was originally named as the Ecological — Activity Hybrid Approach. It was developed during 2017 to 2020 when I worked on several projects which refers to a new type of social action platform.
A key concept of activity theory is “contradictions”. Engeström also used this concept to guide the notion of “expansion”. The concept of “contradictions” can be applied to different levels of analysis.
Yrjö Engeström upgraded the activity theory from the individual activity level to collective activity level with a conceptual model of “activity system” in order to apply activity theory to educational settings, organizational development and other fields