These four basic design principles are largely adhered to in interactive computing systems regardless of whether an application is intended for serious or for more playful purposes, unless it specifically aims to confuse or surprise users, for example, in an interactive treasure hunt.
The principles are also captured in four of the five the items in Lavie and Tractinsky’s classical aesthetics scale.
Thus, a pleasant, clear, and clean user interface design is well organized and orderly, much like Parush et al.’s good example.
The role of symmetry, although recommended by some researchers, is a little unclear. For example, none of the icons in Figure 4 are horizontally or vertically symmetrical, but they are clear and clean, and they do reflect harmony.
The final item in the classical aesthetics scale is ‘aesthetics’, which is somewhat curious in a scale intended to measure that very concept.
In addition to being pleasant to look at, an orderly user interface design would also be easy to use and navigate.