Beginners Guide to Model-Based Systems Engineering

12/18/2018

Activity Diagrams

• Reflects the most complete SysML representation of behavior • Control flow • Data flow (including port) • Allocation • Best suited when dealing with software audiences or working at the design level • Remember “verbs” (SEs) vs “nouns” (SwEs)

111

Key Semantics of Activity Diagrams

• Activities

• Nodes on flow lines (branches) • Number and name standard • “Pitchfork” indicates decomposition • Ports optional to reflect detailed interface specification

• Constructs • Sequence

• Decisions (Select and Multiple-exit) • Fork and Join (Parallel) • Loops (Loop, Iterate, and Replicate)

112

56