5M OR 7P in marketing or 4S in service industry are the prominent inputs. Fish bone diagram deals with the resolving likely causes of these inputs! The basic fundamentals of six sigma is, there are inputs and outputs for a process!
We need to identify key inputs and key outputs. Which satisfy the customers need. When this doesn’t happen, one has to use this fishbone diagram to locate which key input was missing or not performing. This fishbone diagram technique along with brain storming is used for identifying such critical inputs required in the process which were not performing.