The conceptual framework of AT describes generic mechanisms, that is elements common to all human activities. Our idea is to use this genericity to identify computer techniques that a priori support them. This chapter is based on our own experiment in the context of the creation of the CoolDev environment, a tool to support the cooperative development of software. CoolDev (Cooperative Layer for software Development) proposes to orchestrate a set of tools involved in development activities. The basic function of CoolDev is for each player in the process to recreate his/her work environment based on his/her role. AT originates from the Soviet historical and cultural school of psychology founded by Vygotski. Finally, CoolDev, as a groupware, contains a representation of other elements of the activity as the roles of actors who reflect certain rules and division of labor. Controlled Vocabulary Terms