Issues related to the amount of the winning bid and the final contract amount

Can be included in the terms of service, both the contract will be split into two major parts, one is the procurement, the second is the service, both: to ensure the normal operation of the information system for one to two years, the procurement part of the completion of a portion of the payment, and the other with the service cycle of payment in segments. In order to avoid some contradictions, can be added in the terms of service to constrain the content.