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What are the basic principles, objectives and essence of JIT?
First, the basic principles of JIT:

Principle of necessity

Realizing the just-in-time system of human resources can at least bring the following three benefits to enterprises:

1. Reduce personnel maintenance costs. Enterprises should not only pay long-term wages, benefits and other costs to internal employees, but also continue to invest in training fees to improve and maintain employees' skills. Using just-in-time personnel may cost a lot at one time, but it can save a lot of costs in the long run.

2. Constantly absorb external information. Using just-in-time method to attract external talents at any time can strengthen the communication between enterprises and the outside world and obtain all kinds of valuable information in time, especially some technological development trends, which are often difficult to obtain by other channels.

3. Focus on core functions. Practice has proved that the enterprise structure of "big and complete, small and complete" is inefficient, and the trend of virtual management is to gradually separate some functions within the enterprise and assume them by society or other organizations, so that enterprises can exclude non-core factors from the enterprise organization and concentrate on the strategic core links of the enterprise. A series of reforms in China, such as divesting some social functions of enterprises and socialization of university logistics, all reflect this requirement.

(2) the principle of feasibility

Under the planned economy system, the just-in-time mode of human resource management is impossible to realize, but with the in-depth development of market economy, the just-in-time mode has become possible and will develop into a commonly used and important mode.

1. With the development and perfection of the talent market, the mobility of personnel is enhanced and the quality of talents is improved, thus enhancing the availability of external talents. Fiberhome headhunters believe in many headhunting companies, talent centers and consulting companies. Are all available channels. Through long-term extensive contact with these companies, enterprises can easily obtain the needed talents when needed, making JIT possible. Especially in China, abundant labor resources provide resources for enterprises to adopt JIT.

2. The reform of employment system provides convenience for the implementation of JIT. The new labor contract relationship between enterprises and individuals eliminates all kinds of disadvantages of lifelong system, which makes enterprises have greater initiative and flexibility in employing people. By signing labor contracts, enterprises can decide the employment, treatment, performance and dismissal of employees, and can also determine the service time of employees in advance, thus ensuring the smooth implementation of JIT system.

3. From foreign experience, JIT is widely used in human resource management. In foreign countries, talent leasing companies have emerged, which have helped enterprises to hire just-in-time personnel. According to statistics, about 20% of small and medium-sized enterprises in the United States adopt the way of talent leasing, which is a main way of JIT.

Second, the objectives of JIT:

1. Minimum waste (zero waste). JIT requires to eliminate all kinds of unreasonable reasons, and every working procedure in the processing process requires to reach the best level.

2. The lowest inventory (zero inventory). JIT believes that inventory is the proof of unreasonable design of production system, uncoordinated production process and poor production operation.

3. The shortest preparation time (zero preparation time). The length of preparation time is related to batch selection. If the preparation time tends to zero and the preparation cost tends to zero, it is possible to adopt a very small batch.

4. The production lead time is the shortest. The system combines short production lead time with small batch, and has strong adaptability and flexibility.

5. Reduce the handling of parts, and the handling capacity is low. Parts feeding and processing are non-value-added operations. If the transportation quantity and processing time of parts and components can be reduced, the assembly time can be saved and the possible problems in assembly can be reduced.

6. Low machine damage.

7. Small batch.

Third, the essence of JIT:

The essence of JIT is balanced production, that is, the average production of products, which makes the logistics flow in a balanced and balanced way among operations, production lines, processes and factories. In order to achieve balance, JIT adopts monthly plan and daily plan, and adjusts the plan in time according to the change of demand.