How can I make more secure passwords that I can still remember?

This link below leads to a few simple systems described in a paper titled “Simple Formula for Strong Passwords: Dramatically Increase Information Security with Minimal Training, and Without Costly Infrastructure Changes.” (It’s a 42 page PDF .) 
 http://www.sans.org/rr/whitepapers/authentication/1636.php 
 Slightly off topic, but if you must write a password down, see if you can write only part of it, just enough to help you remember the rest. 
 Related Reading 
 
 
 http://xkcd.com/936/ – in comic form 	 Lock IT Down: Creating passwords that are secure and easy to remember 	 Creating Secure Passwords 	 A Future-Adaptable Password Scheme 	 http://www.lightbluetouchpaper.org/2011/11/08/want-to-create-a-really-strong-password-dont-ask-google/ 
 
 If anyone has other suggestions, please add them. 
 See https://kb.ucla.edu/link/1037