新品管七工具（New tube seven tools）.docVIP

新品管七工具（New tube seven tools） It is a scientific management method for arranging and preparing the best schedule and effectively implementing the management schedule. The tool is an arrow chart. The arrow chart is a kind of arrow line represented by the network form according to its chronological order and subordinate relation. A task or project, can be divided into many operations, these operations depend on each other, in the production process and organization of mutual restraint, arrow bar chart can put this operation between the dependent and restrictive relationship clearly expressed. Through arrow charts, key and non key factors affecting the progress of the project can be found out. Therefore, it is possible to co-ordinate and coordinate the rational use of resources and improve efficiency and effectiveness. In terms of schedule and progress kilometres, Gantt Chart is often used. Gantt charts can only give rough plans, simple job instructions, and because of the lack of dependencies between jobs, there are the following disadvantages: 1. it is difficult to give very detailed plans; 2. in the planning stage is not easy batted and thinking; 3., after entering the implementation stage, changes in circumstances and planning changes are difficult to deal with; 4. unable to obtain the correct information about the delay of an operation affecting the whole plan; 5., the design scale is larger, that is difficult to master the overall plan; 6. difficult to determine the focus of progress. In the late 50s, when the United States Navy made the Polaris missile development plan, in order to make up for the lack of Gantt chart, a new plan management method was proposed, which was called plan review method (PERT-Program Evaluation, Review, Technique), so that the missile development task ahead of schedule more than two years to complete. In 1956, DuPont and Rand Co in the United States, in order to coordinate the work of different business departments within the company, pu