I don't keep a password book as such, but if I change them just a bit more frequently, they will compete with my socks!! Seriously, I do change so frequently that a book wouldn't be much good, so I use a 'loose leaf' system by recycling old envelopes. When the back of one is full, it's sufficiently destroyed as to be useless in the wrong hands. It overcomes the many organisations that lose our data frequently and only reveal the fact many months later.In my opinion that gives the crooks time to buy and sell this info which when linked to what they already have, completes the jigsaw for them. My system has worked successfully for me for years. I generate all my passwords and dont opt for websites to remember me. They are often made up of ever longer random strings of characters. A record is kept of only 'live' ones as redundant ones never reused anywhere and no 2 sites share the same PW. My envelopes are like a card index, each one having a title, e.g., ME O/L FORUMS, ME SUPPLIERS, ME CLUBS, INTERNET TRADERS, this last being a miscellaneous group of businesses unconnected with model engineering. Includes supermarkets, Halfords, Premier inns, Bluebell rly., RHDR, organisers of traction engine rallies,etc. Classifying helps me to find what I want a bit faster.