When to rewrite the page

Which question do you ask first about any event?

• Did a line's risk or my situation change?
• Does the page already have a rule for it?
• Would I make more money if I changed the page?

Which of these is a correctly done rewrite?

• The old targets crossed out and new ones written on the same page
• A new page with no date, replacing the old one
• A new page with the next version number, the date and the reason, with the old version kept beside it