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Human Computer Interaction

The way that an operator interacts with a computer system depends on a number of factors.

Physical factors determined by the physical arrangement of the user's workstation and its environment
Psychological factors determined by the way that the software interacts with the user.

User interaction will be affected by the physical environment within which he or she is operating. In general good working conditions will allow the user to work efficiently without losing concentration due to fatigue or stress. Health and safety legislation provides some standards for the physical layout of workstations and their environment but in general terms human - computer interaction will be supported by ensuring the following:

  1. The screen should be visible at all times when required. If the operator needs to use a telephone then the screen must be readily viewable while the phone is being used. If data needs to be transcribed from the screen onto paper then the user must be able to see the screen easily while they are writing.
  2. The screen should be positioned so that it does not face a window - thus avoiding reflections that will make it difficult to use. If this is not possible then filters and blinds should be provided.
  3. Sufficient space should be provided to allow the user to work without being cramped. If the user needs to write then an appropriate surface should be provided. Even if the user will only operate a keyboard sufficient space should be provided for them to feel comfortable and uncrowded.
  4. A sensible colour scheme should be adopted so that the working environment is pleasant and relaxing. Colour clashes should be avoided.
  5. The interface should be user-friendly so that the operator can feel confident in using the system. User confidence can be enhanced by providing on-line support and help screens.
  6. Expert users can become frustrated if they are slowed down by methods designed for novice users. Short cuts - e.g. hot keys should be provided for expert users.
  7. The system should make use of human strengths so that the operator feels valued and competent and also to increase efficiency. The operator might, for example, be able to set up a more efficient search query by adding additional criteria based on previous experience and understanding. This makes use of the human ability to remember and interpret data.
   

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