K.W.
hi,
developmentally, a 16 month old is generally still learning cause-and-effect and cannot make connections that last longer. for example, if a 16 month old gets wet from splashing in the water, he will not understand why he is cold and wet a few minutes later. i certainly encountered frustration with my son when he was about this age, yet redirection, distraction, engaging in some other activity still seemed the most successful and developmentally appropriate.
one book that i HIGHLY recommend regarding discipline is called, "Unconditional Parenting" by Alfie Kohn. it has all sorts of very provocative thoughts about discipline techniques and is very interesting.
also, the Yale Child Study Center's Guide to Child Development addresses discipline and mental development in a research-based way.