Participants and tasks

Choosing participants

Persuade participants if needed. For example if you are building an interface for teachers and they don´t want to participate then you can say that in the end when your product goes to production then they can use it in their work and make their life easier.

Selecting tasks

Real tasks that people would perform while using your interface in everyday life.
Don´t bend the tasks in a way that your preferred design would stand out. That´s cheating!