Network planning technology is a scientific method of planning and management, which is developed with the development of modern science and technology and industrial production. In the 1950s, in order to meet the needs of scientific research and the management of new production organizations, some new methods of planning management were introduced abroad. In 1956, dupont studied the key line method of network planning technology (CPM) and tried it on a chemical engineering project, and achieved good economic results. In 1958 the United States naval weapons when "Polaris" missile plans, applied the plan evaluation method (abbreviated as PERT) project plan arrangement, evaluation, audit and control, was a huge success. In the early 1960 s, the network planning technique, has been in the United States all new construction fully adopt this kind of new method for program management, could be introduced into Japan and Western Europe and other countries. With the rapid development of modern science and technology and the continuous improvement of management level, network planning technology is also developing and improving. At present, it has been widely applied in the fields of industry, defense, construction, transportation and scientific research of the world, and has become a scientific method of modern production management in developed countries. The response to multilayered values is rational. Rational (including abstract thinking with image thinking) is higher animals, are now known to have intelligent human only) on the basis of intellectual responses, to the further development of it by means of language, text or image will intellectual formed by various basic concept and basic image fixed in the form of the second signal system in the brain, and within the brain to be more complex, the deeper, longer series "sex", "rigid instinct", "elastic instinct" and "intellectual" and other forms of reaction. Among them, the cognition of the relation between the basic concepts forms the abstract thinking, and the person's understanding of the relation between the basic images forms the image thinking. Rationality is human to the second signal system of "reflection" type of reaction activity, it can find out the basic concept and basic image, more general internal relation and essence difference between to discover things between the movement of more general and more abstract and change rule. For example, people form "water" and "to..." through the practice of production and life. To ", "low" and "flow", the concept of nouns, prepositions, adjectives, verbs, between these concepts through a certain form of conditioned reflex established a mutual connection, thus obtained the "water flows downwards" such a logic rules.In the early 20th century, famous American economist elvin fisher developed the theory of economic gain. In its book "the nature of capital and yield", first, the concept of yield is analyzed in terms of the performance of earnings, and three different types of benefits are proposed: The European central bank's interest rate and previous decision to taper its bond purchases have been stable: capfafenbach Mehrotra said: "historically, Micron in 3 d XPoint efforts focus on technology development and early stage, but because we are paying more and more attention to high value product solutions, we recently sent a team of product development resources, taking advantage of the opportunity of our eyes."