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The CUSTOMER clicks the REGISTER button on the Home Page. Actor/s: CUSTOMER Pre-condition: An unregistered CUSTOMER. Log-in A new CUSTOMER needs to first register into the system before performing any transaction. The CUSTOMER clicks the Log-in button on the Home Page. Register Order books Sell used books Review books Customer On-line Bookstore System Log-in > Check out > (CustID) Use Case Context DiagramĪ CUSTOMER needs to log-in before performing any transaction Actor/s: CUSTOMER Pre-condition: A registered user. The steps involved: - Identify the actor : CUSTOMER Identify the use case for the actor: CUSTOMER REGISTER LOG-IN ORDER BOOKS CHECK OUT REVIEW BOOKS SELL USED BOOKS For each use case, determine include and extend relationships, if any A Customer must log-in first before he/she can order books, check out, review books or sell used books: include relationship A Customer can proceed to check out after he/she has ordered books: extend relationship Problem : Draw the use-case diagram for the above system
#Online use case diagram online password#
Before performing any one of these transactions, the customer must first log-in into the system using their user id and password kept in their account. On-line Bookstore is a web application that can be accessed by the store’s registered customer, whereby each customer can order books, review one or more books sold in the book store, and sell used books to other customers. Post-condition: The CUSTOMER has been authorised to perform transactions. Ĭustomer Use Case Description: A CUSTOMER needs to log-in before performing any transaction Pre-condition: A registered user. Answer: For every log-in process, there are two flows When the log-in is successful (main-flow) When the log-in is not successful (alternate-flows) For each flow, we can describe the sequence/flow of events. Describe the use case for the log-in process of the on-line Bookstore system.
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#Online use case diagram online software#
Use Case Diagrams Obviously, actor and use case names must be unique within a given diagram Consider use cases to be similar to classes: A use case describes an activity that is possible A given system may have several instances of that activity throughout its lifetime A use case is a (coarse-grained/large) unit of behaviour, and a class is a unit of software Ī simple example Example: In an on-line Bookstore system, user needs to log-in first before he/she could order and purchase any desired books. Use Cases For the auction website example, a system administrator can act in two roles: Administrator Customer Īuction Website Use Cases Auction Website Search for item Place bid Put item up for auction Register account Customer eBay) The actor customer might: Register for an account Search for items by keyword Place a bid on an item Put an item up for auction Check the status of this item Īctors An actor represents a role that a user might play For example, a network administrator at a company might play the following roles: NetAdmin Employee Each role must be represented separately Use Cases For an example, consider an auction website (e.g. Use Case Diagrams Use case diagrams consist of at least two components: An actor Actors are represented as stick people, with a label below, naming the actor's role There may be multiple actors in a diagram A use case Use cases are represented as ellipses, with a label inside, naming the use case There may be multiple use cases in a diagram Use Case Diagrams Use case diagrams describe relationships between users and use cases A use case is a (usually high-level) user activity in the system A use case is a collection of related success and failure scenarios that describe actors using a system to support a goal A use case name should generally begin with a verb