Gives a description of the overall context of ILS in the MOD and states the way in which ILS shall be applied in MOD contracts in the procurement and in-Service support of defence equipment and material. Presents the inter-relationships and the background between the component Parts, putting the 'business' of ILS in context and describes the electronic environment in which this business will be conducted. This part and others of this Standard gives a consistent profile for the application of specific existing standards that are used in the application of ILS.