The Human-System Model - Some Graphics

This section contains some graphics that illustrate the proposed Human-System model.

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The model comprises four processes. The processes represent 'views' of the human-system lifecycle. Processes are considered to run concurrently as opposed to being sequential steps in a methodology. The aim is usability, or quality in use:

Quality in use
“The capability of a system
to enable specified users
to achieve specified goals
with effectiveness, productivity, safety and satisfaction
in specified contexts of use”
(ISO 9126-1).

the four processes of the HS model

HS.1 - Life cycle involvement: This process anticipates the particular HS issues at specific stages of the life cycle. It makes the system life cycle efficient by addressing people in the stage enabling systems for the system. It interacts with the various 'enabling systems' (e.g. HS.1.3 will interact with the enabling system concerned with manufacture). The gear wheel on the outer track represents the emphasis at any one time, while the gear wheels for each life cycle stage represent a continuing interaction with the relevant enabling system.

HS.1 Life cycle involvement

HS.2 - Integrate human factors. This process ensures that HS issues are addressed by the appropriate stakeholders, and includes planning, management and procurement activities. It reduces life cycle costs by ensuring that “design for people” is used within the organisation.

HS.2 Integrate human factors

HS.3 Human-centred design. This process enables user centred technical activity to be focused appropriately. It contributes to a better system by designing for the people who use the system of interest in its context of use. The principles of human-centred design are:

HS.3 Human-centred design

HS.4 Human resources. This process provides the means to resolve issues by means of the human part of the system, rather than the equipment-centred part. It ensures the continued delivery of the correct number of competent people required to use the most suitable equipment.

HS.4 Human Resources

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