Brief description of actors and use cases

Below figure represents the use cases of the proposed project, Social Media (Twitter) Based Depression Measuring System.

The system has two main actors, namely, user and system admin. Anyone willing to receive this depression analyzing service can use this system. He is called the user. The user should be registered to access this system. Upon registering, the User should grant permission via user agreement to analyze the text data gathered from his Twitter account. Then the user is able to request depression level analysis.