I'm working on documenting a situation where an activity (call it 'a') which is not itself on the project critical path has a direct impact on an activity (call it 'b') which is on the project critical path. That is, any delay in 'a' results in a delay in 'b' or failure to complete 'a' results in the failure to complete 'b'. What is the most correct way to describe activity 'a'? Is it a secondary critical path or something along those lines?
Thanks for any thoughts!