This chapter presents a selection of current research works on agent technology which are focused on the development of MAS. The purpose of this chapter is to guide developers through existing theories, methods, and software that can be applied in each stage of a development. However, this guide is not exhaustive due the amount of agent-related research works. Thus authors have added references to consult other information sources and complement the information given here. Readers are encouraged to consult these external references in order to obtain a more accurate view of the field.