GeM has been conceived as a platform for the sale and purchase of commonly used goods and services. The spectrum of goods and services procured by the Government is very wide. The goods procured by the Government range from highly standardized goods like A4 printing paper, printing cartridges and electronic goods like printers and laptops to highly specialized goods like drilling equipment and medical equipment. Similarly, for services, the spectrum ranges from standard services such as security services, chauffeur services and gardening services to a more complex set of specialized services such as consulting services and engineering services. While GeM shall seek to cater to all the buyer needs for goods and services that are commonly used, it shall build its goods and services offering in a staged manner. GeM shall prioritize those goods and services to be supported in the short term that have a low level of customization, are more standardized and have larger transaction volumes in the public procurement domain. As the GeM platform matures, it shall support goods and services requiring higher degree of complexity. At the same time, the GeM platform shall clearly define the set of goods and services that the platform shall never cater to constituting the exclusion list. This shall include goods that are highly specialized and limited to very niche buyer segment, such as defence equipment, and services like mining services.