Well, first you need to perceive your project as a value stream. Value stream mapping can be an important tool for project management processes improvement. Then you need to ensure that the value is specified from the customer point of view. Project managers must also address those wastes by founding the best possible environment for its project team members. He will have to involve functional managers and to sensitize them so to eliminate wastes and to ensure project success. Finally, the project manager must manage customer's intimacy. Possibly, an extreme improvement would be that the project manager collocates with his customer.