Tham khảo tài liệu 'manufacturing the future 2012 part 2', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | The Cobasa Architecture as an Answer to Shop Floor Agility 41 Figure 3. Consortia formation The different coalitions that can be created out of a cluster represent the different ways of exploiting operating a manufacturing system. Adding or removing a component from the physical manufacturing system also implies that the corresponding agent must be removed from the cluster which can also have an impact on the established coalitions. A broker is used to help the formation of coalitions to reduce the complexity of the individual agents in terms of coalition formation. By delegating this responsibility to the broker the individual 42 Manufacturing the Future Concepts Technologies Visions agents can be simpler because all they have to do is negotiate the terms of their participation with the broker rather than carrying out all complex details of coalition formation such as deciding which members are better indicated to answer the requirements of a coalition being formed. The interactions between the cluster and its members are regulated by a contract. This contract establishes the terms under which the cooperation is established. It includes terms such as the ontologies that must be used by the candidate the duration the consideration a law term that describes what the candidate should give in exchange for joining the cluster usually the skills that the candidate is bringing to the cluster . The behaviour of a coalition is regulated by another contract that is signed by all its members. The important terms of this type of contract other than the usual ones like duration names of the members penalties etc. are the consideration and the individual skills that each member brings to the coalition. The importance of contracts as a mechanism to create change flexible and agile control structures consortia lays in the fact that the generic behaviours presented by generic agents are constrained by the contracts that each agent has signed. This calls forth the idea that .