Distributed Systems can be described as two independent entities:

1. • nodes organized as a graph, nodes representing systems, and edges representing communication links.
   

2. •nodes activities represented by local programs contributing to global behaviour.
   

A lot of today challenging problems need abstractions and methods that can be studied from these entities. As example, the wireless sensor networks (WSN) are probably one of the more promising fields in computer science.

The social impact of WSN has been announced since a long time as Ubiquitous Computing (Mark Weiser). Most applications are compatible with sustainable development objectives, in particular energy economies.

This site presents tools and initial concept allowing to explore solutions of distributed system problems as found in WSN.