Final answer:
The Fishbone or Ishikawa diagram is a project management tool to identify causes of a problem. It involves writing down the issue and branching out causes into a fishbone-like structure to uncover root causes.
Step-by-step explanation:
The Fishbone or Ishikawa diagram is a cause-and-effect decomposition tool used in project management. This visual representation helps in identifying potential causes of a problem and sorting ideas into useful categories. To modify the diagram to create a representation of the effect explained, one begins by writing the effect, or the issue to be solved, at the 'head' of the fish.
Then branching out from the 'spine,' several 'bones' representing main categories of causes are drawn. For each category, further lines can be drawn to delve into more specific causes. This methodical approach is aimed at uncovering the root causes of issues within a process or system.