User centred design strategies could be applied. Human-computer interface research generally relates to interactive mode between human and computer, and the layout of computer’s displaying information. It is the medium helping user and computer exchanging information. The subjects of human-computer interaction include computer and computer user. Fig. 3 shows the information flow of human-computer interaction. Human-computer interaction research relates to how to design a computer interface that enables users to achieve the highest efficiency and satisfaction when using the system. The most important principle to be conformed to in human-computer interface design is to learn about product user, so that a usable, easy-to-use and favourite product can be provided to users to serve the availability goal, experience goal and life goal of users. User model refers to information on users contained in the system, and collection of required user information and hypothesis in the process of the system adapting to users. User model is an important research direction of human-computer interface presently and in the next several years an important theoretical basis of task analysis is in interaction design. User centred design strategy or the UCDD as defined by Bannon (1991) states that “What the term user-centred system design means or how it can be achieved is far from clear.” (p. 38). UCDD is a form of approach to design and development and is both product-oriented and process-oriented. The product-oriented approach focuses mainly on the creation of a product. The utilization of the product can be a ﬁxed and well understood idea and this means that design requirements can be determined in advance. The process-oriented approach on the other hand requires designers to view their entire process of development in the context of human learning, work, and communication. The usage of the product in development takes place in an evolving world of changing needs. This involves certain advantages but also imposes various constraints. Because change is the norm in the process, prior speciﬁcations for an end-product are not predetermined completely. In UCDD, plans are just the beginning of the process, but the main mission is not conforming to the plan rather it is responding to changes throughout the life cycle of the project.
In addition, to the above said issues of multidisciplinary teams, there are issues introduced in the form of indirect system concerns and quality of service as well. The indirect system concerns are issues of system design and implementation and the influence of the system on the organization and the system’s influence on the environment. There are issues of quality of service as well where the closeness of the system to the end-user lends special significance to quality of the service delivered. Quality concerns include those of availability, performance, usability and forms of delivery. The design of interactive software systems is hence a challenge by itself.
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