Is the evaluation of a product or service by someone who has the professional training or experience to make an informed judgment on the design. Ideally, this person should not be biased by former involvement with the product since familiarity with any product or task makes it seem simpler and easier. Expert appraisal can be used to
Identify possible causes of design exclusion
Suggest improvements to reduce this exclusion
Increase user satisfaction
Advantages / Disadvantages ADVANTAGES DISADVANTAGES Literature Search Many sources of information are available. Use of ICT to access information, online books, periodicals enhances the search of information, speed and cost , storage & security are all considerations. An abundance of data which can be time consuming. User Trial User trail data is collected by observing users behaviour. The “user” is a non-specialist which makes trials easier and cost effective. “ Users” may carry out tasks in different ways from those expected and be inexperienced in data collection. User Research User research is collected by obtaining users’ responses to questions. Data is relatively easy and cheap to obtain. The data is usually qualitative. Expert Appraisal Expert knowledge and advice are gained. The expert may be biased Locating an expert may be difficult and expensive. The data is usually qualitative.