Sixty preschool children were given the conservation tasks and the processing of successive information tasks. The latters were classified in two types: while the first type needed only to maintain information, the second type needed transformation The test scores were factor analyzed and 2 factors were extracted: the first factor, high-loaded by all successive information tasks, was named “successive synthesis”, while the second factor, high-loaded by the conservation tasks and the second type of successive information tasks, was named “planning”. This result was interpreted in relation to Das's information processing model. The process of transforming information was discussed.