When to use new Term Group rather than creating new Term Set

Question

Can anyone adivce when i need to create a new term group and when i need to create a new term set ?

In my case i have a term set named "Standard" that contain some ISO standards terms. and i am referencing this term set inside some managed metadata columns. now i have created a new site collection and i need to create a new term set also named "Standard" which contain software development standards rather than ISo standards. so i created a new term group and i add the new term set "standards" to it... so my question is when i should create a new term group over creating new term sets ,, other than the reason i mentioned which is to have the same term set name used twice ?..

Answer 1

Groups define security boundaries. A group is a set of term sets that all share common security requirements. Only users who are designated as contributors to a specific group can manage term sets that belong to the group or create new term sets within it. Organizations should create unique groups for term sets that will have unique access or security needs.

In your case, i dont think you have anyother choice then creating a new group, Unless you want to change the name of termset i.e Standards or _Standard etc.