Is Zhihu information reliable?

I don’t think it’s possible on Zhihu! To put it simply, all products should be based on customer needs. For simple products, reliability is one of the quality characteristics. For complex products, reliability may be upgraded to a separate customer need, on the same level as quality. That is to say, for simple products, customers may only specify performance requirements, such as air conditioning filters, or slightly mention reliability, such as light bulbs; for complex products, there will be detailed reliability requirements that will be specific to each job. environment (working profile), etc., such as aircraft.

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Reliability is a branch of quality. You can read the quality engineer's exam book. There is a chapter in it about reliability, so everything except this chapter It is the non-reliability quality part. This answer is a bit tricky, but it can quickly explain the relationship between reliability and quality.

Fourth Floor: You do it, you say it:

Quality definition: Quality is the degree to which a set of characteristics meets requirements.

In other words, the quality of a piece of equipment depends on how well it meets your requirements. For example, the quality of photos taken by mobile phones. If you require realistic imaging effects and good color reproduction, then a mobile phone with a beauty function may not be of good quality for you; and if your requirement is to take a good-looking picture of yourself, then a mobile phone with a beauty function may not be of good quality for you. The beauty camera with skin resurfacing and whitening functions is of high quality to you.

Reliability definition: The ability of a product to complete specified tasks within a specified time and under specified conditions.

Products complete different tasks (that is, different functions), operate in different external environments, and have different reliability.

Take the beauty camera as an example. If you ask the camera to find you every time in a group photo and make you look beautiful, but it can only recognize you five times out of ten times. The remaining five times reveal your true colors (which may also be very beautiful!), so the reliability of this camera’s beauty function is not high.

If you posted the photos on WeChat Moments without looking carefully, and later found out that some of them were not beautiful, thus destroying the image of the goddess (or male god), then you would say: This camera The quality is really bad!

So reliability should be a branch of quality.

Zhihu user 1 on the 5th floor:

Quality = quality reliability

Quality = the deviation between the actual product and the specification requirements

Reliability Quality = the deviation between the long-term performance of the product and the initial performance

Zhang Chengwen on the 6th floor said:

Quality is a set of inherent characteristics of the product, including reliability, and there are two types of inherent characteristics.

1. Professional quality characteristics;

2. General quality characteristics.

Reliability is a type of general quality characteristic. The general quality characteristics include seven categories: safety, environmental adaptability, electromagnetic compatibility, reliability, testability, maintainability, and supportability.

So quality is a big proposition, reliability is only a small part of it.

LN Bebop said above, "In an enterprise, reliability work belongs to the quality system." However, in fact, it is not appropriate to place reliability work in the quality department. It should be placed in the design department, because only in the At the beginning of the design, designers take reliability issues into consideration when designing, so that they can design high-reliability products. If they are placed in the quality department, how can you, a person engaged in quality management, improve product reliability? Can you persuade the designers to change the design? In that case, reliability can only be reduced to superficial work, and just writing reports is of no practical use. A good reliability engineer must have a good understanding of product design.

Mosch (reliability consultant) on the 7th floor said:

I personally suggest that reliability and quality should be separated.

The difference between the two in English is: Reliability is quality over time

The Chinese explanation is that quality only indicates whether the current product is good or not, but reliability can standardize whether the product will be good after a period of time. good. Quality is just a point, but reliability is