ABSTRACT
This “too-little-too-late” problem of human factors input to system development prompted a growing awareness that early and continued human factors involvement in the system development process is vital for effective uptake of its contributions. Early involvement is more effective since appropriate user requirements may be established to constrain design at later stages of system development. An early definition of user requirements is particularly important because humanrelated design issues predominate at early stages of system development. Continuous human factors involvement then supports the appropriate interpretation and translation of user requirements into system design specifications. Continuous involvement also ensures that human factors inputs are timely and contextually relevant to system
development concerns that evolve through the design cycle. In this way, human factors contributions to system development may be optimized.
