UML Use case for vending machine -

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i new uml , need identifying actors , use cases simple scenario. have model vending machine. can't decide on set of actors , use cases , appreciate help. way model have customer actor, switchboard actor , vending machine. customer's use cases insert coins, select product, cancel order, collect change. switchboard use cases set timer (the user has time select product, after process canceled). finally, vending machine use cases find product, check money balance, dispense, return change. thank in advance :)

from vending machine point of view, usecase sell item (or sell product). because of usecase model defines use full services provided modeled system in collaboration actors (actor external system). actions insert coin, find product etc. steps of procedure, define behavior of vending machine within sell item usecase execution. means, usecase model simple. usecase "sell item" connected actor "customer". switchboard part of vending machine , involved internal processes execution.


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