"so rather than trying to load everything into our brains at once, we can focus on a part at a time and develop a good test suite that will point out the effect

"so rather than trying to load everything into our brains at once, we can focus on a part at a time and develop a good test suite that will point out the effects of any changes so you don't have to try to anticipate them and can focus your energy on he problem at hand." Hmm.. Let me ask you something. There's a ton of lectures and blogs written about TDD and what not. Do you consider them mostly valuable or do you consider most of them to be junk?