1. A method for identifying dependencies between components for a given build of a componentised product, the method comprising the steps of: a) selecting a set of components for assembly into a componentised product, said set comprising one or more existing components and one or more new components; b) identifying combinations of said selected set of components providing said componentised product where each said combination of components comprises at least one of said new components; c) testing each of said combination of components and identifying each combination of components that passes or fails said testing; d) for each said combination of components comprising a single first new component and identified as failing said testing, identifying any other of said combinations of said components identified as passing said testing and comprising said first new component and a second new component; and e) for any identified other of said combinations of said components comprising said first and second new components, identifying said first new component as being dependent on said second new component.