Criteria+Based+Model

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=Criteria Based Models=

A model is described as an abstract representation of a concrete entity and therefore doesn't include that may be relevant to the actual realisation of the system once implemented. The aspects or features that that may be included omitted in the design model, is dependent upon its intended use. The type of representation chosen for the model is determined by design result desired. For instance, representation of a model by a flow chart implies that the processes involved in the design under construction would be sequenced When designing a User Centred System, the model of user’s needs usually actuate the design’s specifications through the use of constraints that are basic to human capability such as working memory, attention span, etc. The use of such constraints can establish an evaluation criteria for a design, determining what humans can or cannot achieve. The role of such criteria can be incorporated in the design process and structure.

The five most implemented criteria are listed as follows:

CRITERIA EXAMPLES ISSUES
Behavioural: User Action Needs Compositional: Aesthetics Contextual: The need for a system to be operable in a certain envoirnment. Symbolic: Company Image Performance: System’s Response time Preferential : Market trends Pragmatic: Cost

The use of any of the above mentioned criteria would vary across each task that a design may be intended to execute or faciliate.Confirmation to such constraints doesn't guarantee an excellent systems design but sufficient elements for success.

WORKSCITED:
Candy, Linda. Edmonds, Ernest." Supporting the Creative User: A Criteria-based approach tp interaction Design." [|Design Studies], Volume 18, Number 2, April 1997, pp. 185-194(10). 1 December 2006. < http://www.ingentaconnect.com/content/els/0142694x/1997/00000018/00000002/art85460 >