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What is an USECASE? Why it is needed?

Answer Posted / narendra vyas

use case represents diagrams. there are two types of use
cases BUC-> business use case and SUC-> system use case
In BUC we represent pictures related to Domain and SUC we
represents shapes like elipse,arrows etc. this is the very
first stage of design where we find out actors and related
activity. actor performs happy activity

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