In PowerPoint, draw a horizontal arrow pointing right to represent the main issue, and add angled lines branching off from it like fish bones to represent cause categories.

They are everywhere, but maybe underused in Microsoft PowerPoint presentations. Using an arrow that moves, you can pull the focus from one point to another with a simple click.

You will see various SmartArt diagrams to add. Now, go to the Process tab where you will see various diagrams to draw workflow. You can use a Basic Timeline, Upward Arrow Process, Circle Accent ...

If you're missing the mark when creating 3D shapes in Microsoft PowerPoint, you might be skipping a step. Learn how to apply simple 3D effects by creating a few arrows.