Ishikawa Diagram

Ishikawa-Diagram

Structure
Kaoru Ishikawa basic concept aim theoretical conversion practical example exercise

• born in Tokio 1915
• graduated University of Tokyo in 1939 with an Engineering degree in applied chemistry • worked as a naval technical officer until 1941 • worked for Nissan Liquid Fuel Company • associate professor at the University of Tokyo in 1947 • famous person inQualitymanagement • not only product quality • but also e.g. quality of Management and assistant • developed several quality-tools • One of these tools is the Ishikawa-Diagram (also called Fishbone- or cause and effect diagram)

Kaoru Ishikawa (1915 - 1989)

basic concept
The Idea:

think about possible causes and reasons leading to an effect or a problem

find solution for preventing thoseproblems

basic concept
• one problem/effect • 7 causes lead to the problem/effect • the causes are divided into main- and sidecauses The 7 causes are: 1. Methods 2. Machinery 3. Management 4. Materials 5. Manpower 6. Environment 7. Measurement

basic concept
individual problem/effect needs individual factors

basic concept
individual problem/effect needs individual factors not all 7factors are needed in the diagram

basic concept
individual problem/effect needs individual factors not all 7 factors are needed in the diagram
grade of influence Branch of production: Manpower, Methods, Material und Machine Branch of administration: Management, Environment

basic concept
individual problem/effect needs individual factors not all 7 factors are needed in the diagram
gradeof influence Branch of production: Manpower, Methods, Material und Machine Branch of administration: Management, Environment

e.g. Methods, Machinery, Management, Materials, Manpower

basic concept
individual problem/effect needs individual factors not all 7 factors are needed in the diagram
grade of influence Branch of production: Manpower, Methods, Material und Machine Branch ofadministration: Management, Environment

e.g. Methods, Machinery, Management, Materials, Manpower 5 M‘s

basic concept
individual problem/effect needs individual factors not all 7 factors are needed in the diagram
grade of influence Branch of production: Manpower, Methods, Material und Machine Branch of administration: Management, Environment

e.g. Methods, Machinery, Management, Materials,Manpower 5 M‘s 4P (Place, Procedures, People, Policies ) 4S (Surroundings, Suppliers, Systems, Skills)

basic concept

aim
• find the causes, main- and sidecauses • clarity • interdependence of the causes • improve them for having the wanted effect or eliminate them for solving the problem

theoretical conversion
1. sketch the diagram and inscript the needed causes

theoretical conversion1. sketch the diagram and inscript the needed causes 2. work the main- and sidecauses out

theoretical conversion
1. sketch the diagram and inscript the needed causes 2. work the main- and sidecauses out 3. check the completeness

theoretical conversion
1. sketch the diagram and inscript the needed causes 2. work the main- and sidecauses out 3. check the completeness 4. weight the themain- & sidecauses in terms of meaning & influence

theoretical conversion
1. sketch the diagram and inscript the needed causes 2. work the main- and sidecauses out 3. check the completeness 4. weight the the main- & sidecauses in terms of meaning & influence 5. check the selected causes for rightness

theoretical conversion
1. sketch the diagram and inscript the needed causes 2. work themain- and sidecauses out 3. check the completeness 4. weight the the main- & sidecauses in terms of meaning & influence 5. check the selected causes for rightness 6. The team discusses about the solution

theoretical conversion
6. The team discusses about the solution

• causes that can be improved or eliminated easily will be finished first of all (no need to be weighted) • The weighted...