Consistency in interface design is paramount in developing a
usable system. The system must present consistency on several
levels: within the application, between applications, and
consistent with our perception of the external world. Without
consistency the application will fail to achieve the intended
purpose of allowing the interface to dissolve into the background
of the work environment. As well, a rounded set of principles are
needed to ensure most interface designs are usable.
The readings present some points of view which should be followed
to promote consistency and usability in interface design. Monk,
sees the need for Action-effect and Task-action consistency. While
Zuschiag looks at degrees in which inconsistencies can affect an
With the readings can you adequately discuss the different types
of consistency? Can principles be applied to general interface
design. Be prepared to discuss the various principles of interface
design. After the readings, choose some examples which show your
understanding of the principles.
Find examples of consistency Contradiction and Irregularity and
present these to the class.
Marks will be awarded for presentation, preparation and participation in the discussion which exhibit emulsion into the subject matter. Students who do not come prepared can expect a low participation mark.