I use Evernote for everything in my business and personal life.
In my business a Note is created when an enquiry comes in by phone or email. Within that Note there will be at least one 'tick box'
As well as a 'tick box' for each task, I always have a final 'tick box' to say the whole Note has been completed.
In a meeting each task that I have to complete has a 'tick box'. With the same final 'tick box' to say everything has been completed.
Notes that have not been completed stay in my Notebook entitled 'Diary - 2015'. By using a date code followed by company name and persons name I can easily see the date a note was created meaning how old it is. For example:
151218 - SWI - Chris Grew
Once all 'tick boxes' have been completed within a Note, that Note will be moved to the Notebook 'Diary - 2015 Completed'
On average I create 15 - 30 new Notes per day. With a total in excess of 20K