To get any point across more than likely no matter how strong the individual reasonings are, present three reasons. Also have the strongest reason as your second reason.
- First reason gets listener’s attention.
- Second presents reasoning.
- Third shows tenacity/preparedness.
Fourth and beyond start overwhelming all the parties. So best to avoid.
Remarks
A quick google led me to Power of Three.
Kind of like we remember three things very vividly.