From Joomla we want to connect to a webservice, retrieve data and show it in graphs. When a user logs in, Joomla must check with the webservice, if the user is allowed to login. When the user is allowed to log in, he sees the data he is allowed to see and can select what he sees. Again all this data is retrieved through the webservice.
We'll provide more detailed specs later when you are selected to do this project.