MATES will be conducted in conjunction with the Web Intelligence conference (WI). As a consequence the social events, PhD mentoring, and keynote sessions are conducted together. Additionally, every participant of each event may participate in all events/sessions/tutorials/workshops.
However, MATES has its own printed proceedings and is supported by the German Computer Science society (GI). While in principle it doesn't matter if you register for MATES or WI, we need to know how many proceedings we will need. Thus, we strongly suggest that participants of the MATES conference download and fill the registration form and Email it to Bjoern Schwarzbach (firstname.lastname@example.org). He will then send you a bill and you can transfer the money. This will guarantee that you will get a copy of the proceedings (Springer LNAI/LNCS volume 10413) at the conference.
All of you who have registered already via the WI registration system, please contact Bjoern by Email in order to reserve a copy of the proceedings for you - you don't need to change anything or do anything else. Of course, everybody who is not a member of GI but a member of ACM or IEEE or any computer science organization associated with GI/ACM/IEEE can fill the GI membership field and will get the reduced fee.
To summarize - if you register via this form you will not have any disadvantages - only the advantage that you will get a copy of the proceedings and can register as a GI member (if applicable).
Looking forward to seeing you in Leipzig!