Errors in thinking or understanding would show up as errors in the output of the programs. Because Turing contains a debugger, the source of error can be found and the solution reworked. Some refinements were made to make the lesson more practical to deliver. For example, the idea of using a shoebox to represent a variable is good because it can physically contain its contents. So coloured paper replaced the idea of shoeboxes.
Coloured paper is much easier for teachers to obtain.
The description of the lesson development provided an overview of the learning theories that underlay the lesson. In this section I will analyse the lesson with respect to two theories of instruction. These transformations include sensory memory, selective attention, pattern recognition, perception, retrieval, encoding, retention and so on. Informing learners of the objective. Stimulating recall of prior learning.