The selection of a proper seller is critical to the success of a project. All of the below would be considered good selection criteria for a buyer to use to select a seller, except
proprietary rights of buyer, life cycle cost of product, and warranty offered by seller.
past work done by seller, intellectual property rights, and references associated with a given seller.
technical capability of seller, understanding of work by seller, and business type of seller.
managerial approach of seller, capacity of seller to do the work, and buyer's ability to create a WBS.