I have got confused so many times about why projects or actions become invisible in my various perspectives that I created two Apple Numbers 3 spreadsheets so I could try to develop an intuitive feel of OmniFocus 2 Pro. Maybe others will like my idea and get some value from it or improve upon it. If you find mistakes in the spreadsheets, I would dearly love to hear about it. Here are the spreadsheets, which can be viewed via a web browser and downloaded in various formats:
