The third phase of the project life cycle is the implementation of the proposed solution. This phase begins after the customer decides which of the proposed solutions will best fulfil the need and an agreement is reached between the customer and the individual or contractor who submitted the proposal. This phase, referred to as performing the project, involves doing the detail planning for the project and then implementing that plan to accomplish the project objective. During the course of performing the project, different types of resources will be utilized. For example, if the project is to design and construct an office building, the project effort might first involve a few architects and engineers in developing the building plans. Then, as construction gets under way, the resources needed will substantially increase to include steelworkers, carpenters, electricians, painters, and the like. The project wind down after the building is finished, and a smaller number of different workers will finish up the landscaping and final interior touches. This phase in the accomplishment of the project objective, leaving the customer satisfied that the full scope of the work was completed in a quality manner, within budget, and on time. For example, the third is complete when a contractor has completed the design and installation of a customized automation system that satisfactorily passes performance tests and is accepted by the customer or when an internal project team within a company has completed a project, in response to a management request, which consolidated two of its facilities into one.