PDL

• Language derived from a programming language like Ada and contains additional, more abstract, constructs to increase its expressive power

• Checked syntactically and semantically by software tools

• Requirements omissions and inconsistencies inferred

• PDL is useful if:

  • when operation is specified as a sequence of simpler actions and the order of execution is important
  • when hardware and software interfaces have to be specified

• Disadvantages

  • insufficient expression, design decisions may be made too early

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