This contribution is a glimpse of processes connected to preparation, implementation and self-evaluation of a workshop. The chosen workshop, for this research, is aimed to teach some basics of radioactivity to high school students (ISCED 3) or students in the last years of a lower secondary school (ISCED 2).
The research sticks to the basic principles of action research (e.g. [1]). Therefore, it is based on cycle of observation, evaluation, implementing some improvements and repetition of the cycle again.