example

Description

A guest can log in by providing the identifying information. After successful login process, the user is identified as a subscribed user.

Actors

guest user.

Pre conditions

1. The user is not logged in yet.
2. The user is from a guest user

Parameters

email, password.

Post conditions

the user is identified as a subscribed user.

Sequence of events

1. The user enters the required information .
2. find the user's information in database.
3. The user assigned to subscribed user.

Alternative flows

1. No user with the given user identifier exists.

1. The user try to log in with a non existing user identifier or incorrect password.
2. The system returns a matching error message to the user.