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Use Case Specification: Login

Use Case Specification: Login
  • Description 
  • Flow of Events 
  • Special Requirement
  • Pre-Conditions
  • Post-Conditions
  • Nodes 
Description 
  • Any registered user can login 
  • After clearing the verification he/she can initiate subsequent actions 
  • A registered user can login and upon verification, can initiate subsequent actions
Flow of event 
Basic flow 
  • The 'login' action is initiated when a registered user chooses to 'login' 
  • The system prompts for username and password 
  • The registered user first enters the username and password and then submits them 
Special requirements 
  • The user is given three consecutive chances to login with a username/password combination. If he/she makes three unsuccessful tries consecutively, the account gets locked 
  • The minimum length of password allowed is 8 characters. The password must include a combination of characters and at least one non-alphabetic character
Pre-Conditions 
  • User must have an account with the library system i.e., he/she must be a registered user.
Post-Conditions 
Primary success post-condition 
  • It is considered that the user is authenticated and is viewing the main page from which initiation of the additional actions can be done. 
Login failure 
  • If the login fails owing to certain reasons described in the alternatives, an appropriate message will be displayed. Eventually, the user is not considered authenticated. 
Nodes 
  • Until now, we have not done much with roles 
  • The "appropriate message" above is vague; we need to come up with how we report this to the user 
  • We must talk to security people as regards 'how reasonable it is to lock the user account after the user made some number of failed attempts. If it is made a rule, we'll need an unlock account use case

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