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What are the kinds of actors used in OOSE ?

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What are the kinds of actors used in OOSE ?

(a) Primary

(b) Secondary

(c) Ternary

(d) Both Primary and Secondary

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This interesting question is from Requirement Elicitation topic in chapter Requirement Engineering of Software Engineering

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Correct option is (d) Both Primary and Secondary

Explanation: A primary actor is one having a goal requiring the assistance of the system whereas, a secondary actor is one from which system needs assistance.There is no such thing as ternary actor in Software Engineering.

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