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Reliability is a branch of quality. You can look at the quality engineer's exam book, which has a chapter on reliability, so everything except this chapter is unreliable. This answer is a bit tricky, but it can quickly explain the relationship between reliability and quality.
You can do it on the fourth floor. You said:
Definition of quality: quality is the degree to which a set of characteristics meet the requirements.
In other words, the quality of a device depends on whether it meets your requirements. For example, the photo quality of mobile phones, if you require the real imaging effect and good color reproduction, then the quality of mobile phones with beauty function may not be good for you; And if your request is to take a good look at yourself, then a beauty camera with peeling and whitening function is of high quality to you.
Definition of reliability: the ability of a product to complete a specified task within a specified time and under specified conditions.
Products accomplish different tasks (that is, different functions), and their reliability is different in different external environments.
Take the beauty camera as an example. If you ask the camera to find you in a photo every time and make you beautiful, then it can only recognize you five times in ten photos, and the remaining five times will expose your true colors (maybe beautiful! ), then the beauty function of this camera is not reliable.
If you send photos to a circle of friends without looking carefully before, and later find that some photos are unattractive, thus destroying the image of the goddess (or male god), then you will say: The quality of this camera is really poor!
So reliability should be a branch of quality.
5th floor Zhihu users 1:
Quality = quality+reliability
Quality = deviation of actual product from specification requirements
Reliability = deviation between long-term performance and initial performance of products.
Zhang Chengwen on the sixth floor said:
Quality is a set of inherent characteristics of products, including reliability. There are two inherent characteristics.
1, professional quality characteristics;
2. General quality characteristics.
Reliability is one of the general quality characteristics. General quality characteristics include safety, environmental adaptability, electromagnetic compatibility, reliability, testability, maintainability and supportability.
So quality is a big proposition, and reliability is only a small part of it.
LN Bebop said, "In an enterprise, reliability work belongs to the quality system", but in fact, it is not appropriate to put reliability work in the quality department, but should be placed in the design department, because designers can only design products with high reliability in mind at the beginning of design. As a quality manager, how do you improve the reliability of products? Can you persuade the designer to change the design? In this way, reliability can only be reduced to superficial work, and just writing reports is of no practical use. A good reliability engineer must know a lot about product design.
Mosch (reliability consultant) on the 7th floor said:
Personally, I suggest separating reliability from quality.
The difference between them in English is that reliability is quality over time.
China people's explanation is that the quality only represents whether the current product is good or not, but the reliability can be standardized after a period of time. Quality is just a point, but reliability is.