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AbstractPurpose -To introduce chromatic methods and their application to monitoring complex systems. Design/methodology/approach -Complexity is introduced and the need for holistic monitoring is suggested. The chromatic methodologies are introduced and their broad-ranging applicability is illustrated with reference to a number of diverse applications. Findings -The generic chromatic monitoring technology has much to offer as a way of visualising, understanding, monitoring and controlling complex processes and system behaviour. Practical implications -The technology is leading to new ways of characterising and evaluating aspects of system behaviour, in a holistic and nonintrusive manner, that are difficult to measure -e.g. walking behaviour of the elderly, tiredness of drivers. Originality/value -Draws out the generic basis of the chromatic methodology and how it may be applied to a wide range of complex systems and situations to predict when and where human intervention is required.