Atoms
Abstract
Atoms concerns atoms and events, the fundamental building blocks of systems. An atom has a behaviour: the sequences of events that can change its state. Behaviours are modelled by finite-state automata that change state in response to events. The relationship between events and states can be expressed in the form of an event-state diagram. Sometimes the sequence of events can only be controlled correctly by introducing a new, so far undiscovered, type of atom. Discovering the events and states that affect each kind of atom is an interactive process called event-state analysis, which is an important fact-finding tool in systems analysis. The analyst must decide which events are important in the light of business requirements. ...
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