Cultural-Historical Activity Theory

In his comment to https://stream.syscoi.com/2026/04/13/boundaries-as-opportunities-for-learning-duck-and-searles-2026/, Bob Williams said:

For those interested, there is a particular systems methodology called (for rather obscure reasons) Cultural-Historical Activity Theory, or CHAT for short. CHAT was developed by Mike Cole and Yrjö Engestrom. Etienne Wenger later of Communities of Practice and Situated Learning fame, was also involved in the early days. CHAT is based on the idea that if systems approaches are intended to be opportunities for learning, then why not develop a systems methodology based on learning theories. In this case, it was based on Vygotsky’s ideas of learning as a social process. CHAT is a fascinating approach that has strongly influenced my practice, but in essence is based on the idea that an individual’s journey to fulfilling a need is mediated by the tools they use (including language), the rules of the community they are part of and the roles that they play in that community. How an individual learns how to fulfill that need is dependent on how they addresses and resolve the contractions within and between tool, rules, roles and needs. Now expand this into a work setting (ie a community of practice) where people are working on the same activity but fullfilling different needs, and you have a whole bunch more contradictions that need to be addressed, as this article so succinctly describes. CHAT is frequently used in high risk environments especially concerning health and safety issues, where contradictions abound. If anyone is interested to find out more, there is a description of CHAT in my book System Diagrams, along with the questions that CHAT addresses. The book is donationware (ie free but you can pay something if you wish) and can be downloaded from https://bobwilliams.gumroad.com

This inspired me to do a little run on CHAT – and also links to

Cultural-Historical Activity Theory

Cultural-Historical Activity Theory