Purpose of Retired activities in Schedule

Member for

16 years 3 months

Glad I could help 

Member for

11 years 6 months

Thanks for the detailed explanation Zoltan. it  makes sense.

Member for

16 years 3 months

an actviity can be in one of 4 categories

not started

in progress 

completed

modified in progress using suspend and resume

whne you say retire completed I do not know what you mean ? I also do not know what a non performed actviities are

if you mean the activities are no longer in the scope then I would should show the same actual start and finish date equal to the date that you were told that this activity is not longer in the scope. 

PUtting 1 day duration WILL make them critical making them complted will not

I would also assign an activity code theses and make a comment in the notes tab. This way you can filter and gropu these if need be.