You can apply all the topics you are interested in. Make a separate application for each supervisor. In application, practise writing of general application for a job. Behind the link aarresaari you can find some hints for writing an application.
If you apply more than one topic, you may attach a priority list with your applications.
The application should be given in printed form to Jussi, as soon as possible (bring either in departmental office or put into my mail locker.
In many cases, the exact content will be discussed with the supervisor.
Topics of Educational Technology Group
Topics of Color Research Group
Topics of Sofware Engineering Group
Topics of SIPU group
Topics in Companies
Topics at the Faculty of Forest Science