In open teaching, knowledge about the learning progress of each individual child plays a significant role. The Flex and Flora diagnostic booklet offers learning progress checks at key points in the four booklets. The tasks included in the diagnostic booklet are related to and coordinated with the units of the four booklets. A child should only move on to new units after they have reached the appropriate learning progress check in the diagnostic booklet via the stop sign at the end of a unit and have successfully completed it. Thus, the learning progress checks are integrated into the work on the units at an individual time, depending on the child's learning pace. The children work on the learning progress checks independently. The diagnostic booklet accompanies the children throughout the school year and clarifies their individual learning process. The teacher can then directly assess these results.