Questions about example sentences with, and the definition and usage of "Systematic"

A: What we need is a systematic approach, we can't have everyone doing their own thing.

For easy access, the files should be organized into binders.

A:
They’re pretty much the same. The only difference is…
Systematic is the ability to do something according to plan, yours of someone else’s. It focuses more on the ability to follow it.

Methodical is the ability to do something in an organised way. Whether there was a plan beforehand or not it’s not important. This word focuses on how the steps are linked and carried out.

A: Systematical has the same meaning as systematic, but systematic is preferred

A: systematic