Revisiting old ground

Recently I have had some great new finds just by thinking of a different angle to search  under. I found myself revisiting records that I thought I had wrung dry.  Perhaps it was just the new angle that generated whole line of new results or that so much more is now available on the net.  Now to think of some other item that needs a fresh look......  For example I had been in contact a few years ago with Guinness archives and checked employment records of four family members and only managed to find two and accepted that others did not exist.  But recently the archives are posted online and lo and behold the missing two are there and are definitely the right chaps.