This means that a program presents the equivalent of forms on the computer that can be rapidly filled in. A user should be able to quickly move backward and forward through the forms and screens. Some load calculation programs use these techniques, but many do not. The layout and organization of a program greatly affects how easy it is to understand and enter data. However, if there are too many menus, the program can be confusing.
Good programs have a nice balance between the number of menus and input screens.
Program ease of use is a subjective matter. A contractor should try a program before buying it, to see whether it makes sense to him. Ideally, a contractor should try as many programs as practically possible to find one that works best for him. Reviewing literature or even the user manual is not enough to evaluate a program. The only way to see how it really works is to see it run.