A Modern research continues to find that scaffolding systems which an effective teaching strategy.Two recent studies regarding construction the use of inscriptions for teaching scientific inquiry and experimentation such as external representations – graphs, tables, etc.Its found that the usage of external representations, representational scaffolding systems, can serve as an effective strategy for teaching these scientific skills.In one study the instructional goal was to teach fourth graders valid experimentation skills.During the first part of the construction -specified table of variables was the scaffold provided.Construction companies had to select the appropriate variable related to their experiment.