Making a fishbone diagram is a two-step process: one, analyzing the cause/structure of the problem; and two, drawing the fishbone diagram.

1. Analyze the cause/structure of the problem.

A, for the problem point, select the layer method (such as man, machine, material, method and environment, etc.).

B, according to the brainstorming respectively on the various layers of categories to find out all the possible causes (factors).

C, will find the elements of the classification, organization, clear their subordinate relationship.

D. Analyze and select the important factors. e. Check the descriptive method of each element to make sure that the grammar is concise and the meaning is clear.

Analysis of key points: a, to determine the major cause (big bone), field operations generally from the "people, machines, materials, laws and regulations" to start, management issues generally from the "personnel, time, place and material" layer, should be decided on a case-by-case basis;

b, the major cause of Must be described in neutral terms (does not indicate good or bad), medium and small key factors must use value judgment (such as ... bad);

c, brainstorming, should be as much as possible to find out all the possible reasons, not limited to their own full control or the content is being implemented. The human cause, it is appropriate to start analyzing from the action rather than the attitude side of the mind;

d, in the key with the value of the characteristics, small key with the key cause of the direct relationship between the cause - the problem, small key should be analyzed to the direct countermeasures;

e, if a certain cause can be attributed to two or more factors at the same time, the strongest correlation shall prevail (if necessary, consider the three presentism: that is, the present time to the The scene to see the present thing, through the comparison of relative conditions, to find the most relevant to the strongest important cause categorization.)

f, the selection of important reasons, not more than seven, and should be identified in the most unterminated cause;

2, fishbone diagram drawing process

A, fill in the head of the fish (according to the description of why not good way), draw the main bone

B, draw the big bone, fill in the big important cause

C, draw the Middle bone and small bone, fill in the small and medium important factors

D, use special symbols to identify the important factors

Points to note: When drawing, make sure that the large bone is at a 60-degree angle to the main bone, and the middle bone is parallel to the main bone