Abstract. Similarly to institutions in human societies, Electronic Institutions (EI) provide structured frameworks for Multi-Agent Systems (MAS) to regulate agents' interactions. However, current EIs cannot regulate a previously existing dynamic social system and deal with its agent population behaviour changes. This paper suggests a solution consisting of two EI extensions to incorporate situatedness and adaptation to the institution. These two properties are usually present at an agent level, but this paper studies how to bring them to an organisational level. While exposing our approach, we use a trac scenario example to illustrate its concepts.