Design and realisation of a knowledge base

Tab4. Authentication scenario

case	Authentication
Actor	All users expect simple visitors
Scenario	Succeeded
Pre-conditions	User already created
Actions	The system presents the home portal The user selects connect button The system presents the login formulation The user enters his login and password The system verifies and accepts or refuse the user's identity
Post condition	The user is authenticated and is registered in the current session
variants	The user enters an invalid login / password The system asking him again to authenticate.

Fig8. Activity diagram: Authenticate

Textual case scenario "Consult privileged space"