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A variation is generally defined as any change to the extent, quality and/or type of a service leading to a change in the cost of the service and/or the program for delivery of that service. It is good practice to discuss this with your client prior to engagement that it is not possible to know exactly how the project will develop and that unforeseen circumstances may result in a change to the services to be provided which may result in variations to architectural services. The variation may result in an increase or reduction in fees.