It is based on an operational model in which the specification can be used to validate and optionally change the state of clients, but in a feature unique to bcfg2 the client's response to the specification can also be used to assess the completeness of the specification. Using this feature, bcfg2 provides an objective measure of how good a job an administrator has done in specifying the configuration of client systems. Bcfg2 is therefore built to help administrators construct an accurate, comprehensive specification. Bcfg2 has been designed from the ground up to support gentle reconciliation between the specification and current client states. It is designed to gracefully cope with manual system modifications. Bcfg2 can also enable the construction of complex change management and deployment strategies.