Out of 7 QC tools cause and effect diagram helps to find the potential causes of an effect. An effect may be good or bad. With help of brainstorming again and again cause and effect diagram constructed for an effect and its possible causes. This activity is going on until the root cause find out. The tools is developed by Prof. Kaoru Ishikawa, therefore the tool is also named as Ishikawa diagram. Cause and Effect diagram is also named as Fishbone diagram due to its structure. The structure of cause and effect diagram is seems like the skeleton of a fish. The structure of the cause and effect diagram is made by arrows. In which the central arrow represent the effect at its head. The rest arrows are pointing toward the central arrow and representing the main causes. At any stage the main cause is considered as effect so that its possible causes are further being found. The main causes are defined as the Man, Material, Method, Machine, Money and Environment. The sub causes of main cause are representing by more arrows pointing towards the main cause.