Case Studies

The RR practices documented in this article span thirteen issues of the Activity Analysis Network newsletter and a wider body of related work produced between September 2025 and March 2026.

In May 2026, I recognized that the trio of concepts I had recently developed — Theoretical Activity, Theoretical Enterprise, and Theoretical Platform — was itself a product of a smaller, nested confluence.

A dialogue between two theoretical traditions may generate mediating concepts...But it is not always sufficient to establish a distinctive knowledge niche.

To examine this ecology, the article focuses on one of its most generative nodes: the knowledge enterprise built by Yrjö Engeström and centered on CRADLE. Two analytical tools from the Weave-the-Theory toolkit are used.

When a theoretical tradition reaches a moment of broad cross-boundary expansion — entering many disciplines simultaneously, forming a Creative Delta — the Curativity Line work at that moment is foundational: ... This is the Second Founding...

What makes a theoretical tradition a tradition — rather than simply a collection of works — is the collaborative structure that holds it together across time... It means something more structural: a before–after relationship between creators.

Together, these four contributions give the concepts of Theoretical Platform and Theoretical Enterprise the analytical depth they need to function as productive tools within the Weave-the-Theory toolkit.

Capturing the Essential Difference of a Theoretical Tradition

What I did not expect was that, years later, my own explorations in this direction would lead to a similar situation.

The AAS case adds a methodological contribution that none of the previous cases feature. It demonstrates the Aspects-to-Approaches crossing as the originating move of theoretical work — a crossing that happened in less than a month ...