Development strategies of user-interlaces have been changing rapidly. User-interlaces are no longer the byproducts of the traditional software development process. Interface designers are now more concerned with the usability of the product rather than its pure technical optimization. It has been recognized that higher usability can only be achieved if interfaces are designed by human factors specialists and implemented by software engineers. Clearly, there exists a need for an effective and unambiguous (i.e. non-prose) form of communication between the designers and implementers of user-interlaces. / Master of Information Systems