Chemical reaction networks are compounded by a set of molecular species {a,b,c,d,...} and a set of reactions. For example:

2a+b+c —> a+2b+d   is a reaction.

The picture on the left shows how to represent a system where multiple reactions can occur.

Chemical organization theory explains how to use information provided by the network to predict long-term qualitative behaviour, mainly the stability or decaying of the species.

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Furthermore, the reaction network approach can be used to model social systems. Most social models are besed on agents as the basic unit of modeling (MAS). In our approach, rather than simulate agents, we use molecular species that represent decisions that agents can take. The interaction among these decisions generates new decisions (molecular species). We can apply chemical organization theory to study the stability of large scale decision systems. (see papers section).