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CHAPTER Modeling Message-Based Behavior with Interactions 10 This chapter discusses the use of sequence diagrams to model how parts of a block interact by exchanging messages. 10.1 OVERVIEW In Chapter 9, behavior was modeled using activity diagrams to represent a controlled sequence of actions that transform inputs to outputs. In this chapter, an alternative approach to representing behavior is introduced. This approach uses sequence diagrams to represent the interaction between structural elements in a model as a sequence of message exchanges. The interaction can be between the system and its environment or between the components of a system at any level of a system