Aim of the Primary Education in Science through "Hands" ? the Experimentation workshop is to train (with hands activities) in-service teachers of primary education, who are currently teaching science, in the experimentation by integrating the experimentation in the scientific /educational methodology (triggering of interest, making hypotheses, experimentation, writing results / conclusions, generalization, microscopic explanations and applications). Apart from this experimentation some ?best practices? for the optimization of the educational proccess will be demonstrated during the workshop.