One of the best features of the program is that once the user learns to navigate through one module, he or she knows how to navigate through all the modules. We had previously reviewed the World of Physics CD-ROM for the Way Cool site and found the other CDs to have the same general format. Users are given the choice of letting the computer choose the problem or choosing the problem themselves. Each module consists of several problem statements accompanied by questions dealing with the statement. Some of the questions require the user to read the original statement carefully to determine an answer.
Some questions require the user to determine the answer by referring to a diagram.
Other questions require the user to have some knowledge beyond what is given in the problem statement. The latter type of question is the most difficult to answer, but hints and tutorials are available to help the user. When the computer is allowed to select the problem, the user is always presented with the main problem for a particular concept. If the user does not correctly answer the questions for the main problem, the computer will present a problem from the same concept or level or even from a lower level. There is a pictorial representation of this sequence of movement through the problems, called the Knowledge Entity Tree, as well as a list of the problems.