5WHY analysis method: the principle and key points of 5WHY analysis method

5 Why is the funnel divided into four steps:

Each step has its own core solution, such as the key first step:

Let's look at the two analysis methods used in the first step: 5W2H and 5m1e.

The 5W2H analysis method, also known as the seven-question analysis method, was initiated by the US Army Weapons Repair Department during World War II. It is simple, convenient, easy to understand and use, and enlightening. It is widely used in enterprise management and technical activities, and it is also very helpful for decision-making and implementation activities, and also helps to make up for the omissions in consideration.

Inventors use five English words beginning with W and two English words beginning with H to ask questions, look for clues to solve problems, find ideas for inventions, design ideas and come up with new invention projects. This method is called 5W2H method.

(1) What is this? What's the purpose? What do you do?

(2) Why-why do you want to do it? Can we not do it? Is there an alternative?

(3) Who-who? Who will do it?

(4) When-when? When will it be finished? When is the best time?

(5) Where-where? Where to do it?

(6) How? -How? How to improve efficiency? How to implement it? What is the method?

(7) How much-how much? To what extent? How about the quantity? What is the quality level? What is the cost output?

Advantages of 5W2H:

1, which can accurately define and clearly state problems and improve work efficiency.

2. Effectively control the essence of the event, completely grasp the main skeleton of the event, and return to the original shape.

3. Simple, convenient, easy to understand and use, inspiring.

4. It helps to organize thinking and put an end to blindness. It is helpful to think about the problem comprehensively and avoid the omission in process design. 5M 1E analysis method

What is the 5M 1E analysis method?

He is: There are six main reasons for the fluctuation of product quality.

A) People/manpower: the operator's knowledge of quality, technical proficiency and physical condition.

B) Machines: the accuracy and maintenance of machines, equipment and fixtures;

C) Materials: composition, physical properties and chemical properties of materials;

D) Method: This includes processing technology, tool selection, operating procedures, etc.

E) Measurement: Whether the method used in measurement is standard and correct;

F) Environmental temperature, humidity, lighting and cleaning conditions in the workplace;

Because the English initials of these five factors are M and E, they are often abbreviated as 5m1e.. Whenever one of the elements changes, it must be recalculated. Process quality is influenced by six factors, namely, people, machines, materials, methods, environment and measurement. Work standardization is the standardization of 5m1e.

5 Why are there two ways to solve problems: 4M 1E and? Classification of causes.

The focus of the above picture is to find the last essential reason, no matter what the direct reason is.

What are the two methods of applying 5WHy analysis?

1, from maturity status analysis

2. In principle.

1. Analyze from the due state: repeat "why" and find out the reason.

Applicable to: the phenomenon is easy to be clear, and the cause is close to a single cause.

? Method: Repeat "Why" to find out the reason.

The following figure is a very good case from due state analysis:

2. In principle.

Applicable to: the site occurrence mechanism is complex and there are many reasons.

? Analysis diagram of bolts in the following figure: