Most of the time the particular form type will be relatively obvious. The specific layout and features of the form object available to you as a developer, will offer many choices. Thus, some forms require many design decisions. C/SIDE allows you to create forms with vastly different "look and feel" attributes. But the standard NAV application only uses a few of the possibilities, and closely follows a set of GUI (Graphical User Interface) guidelines, already published, that offer close compatibility with other Windows and Microsoft applications.
Good design practice dictates that enhancements should integrate seamlessly unless there is an overwhelming justification for being "different". The best advice you can follow for design of forms is to make your new forms have the same look and feel as the forms in the "out-of-the-box" product. When you add changes to forms, make changes look as similar to the original form look and feel as your new functionality allows.
There...