How can you be so sure that these 24 items will generate the accurate information needed for the analysis?

The 24 questions (actually 48 questions) do not always create accurate results (Profile). The key is to have a system that identifies when the results are accurate and when they are not. The method is purely statistical; we have actually one question (including two sub-questions) that is then repeated 24 times. The key is to identify if the person has been able to establish a certain answering pattern, which is the same in both subquestions and which he/she has been able to follow consistently throughout the questionnaire. The result you can see in the shapes, size and position of the two Profiles.