In Software Engineering Jackson's Principle based on A. Designation B. Definitions C. Refutable Assertions D. Formal Review E. Requirement Elicitation Choose the correct answer from the options given below:
A, B & C Only
Michael Jackson, in his work on software requirements and specifications, argued that a requirements description must be precise about how its terms relate to the real world. He proposed three kinds of statements on which such descriptions rest.
A. Designation: a designation is an informal but precise rule that tells how to recognise a basic phenomenon in the world and gives it a formal name (for example, 'x is a mother of y' recognised in a stated way). It anchors the formal terms to reality.
B. Definitions: once basic terms are designated, further terms are introduced by formal definitions built from designated terms, adding no new facts about the world.
C. Refutable assertions: statements about the world expressed in the designated and defined terms that could in principle be shown false by observation; these carry the actual content of the requirements.
D. Formal review and E. requirement elicitation are activities of the requirements engineering process (validation and gathering), not elements of Jackson's descriptive principle, so any combination including D or E is wrong.
A, B & C Only option is correct.
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