My report relates to the design and analyzes situations of innovating Laboratory work scaffolded by numerical platform. We want to clarify in particular the role of the personal symbolic representations in lab works in domains of life sciences and Earth, when they are produced by the pupils using a experimental platforms. It is a question of proposing a model which supports the idea that the cognitive productions that they work out during the various stages that a T.P. comprises. help the pupils to make sense to the experimental activities.
