Don asked:

What are some of the difficulties faced when trying to research human behaviour?

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This is one of the o-old questions that I'm answering just for the fun of it... Here's one problem: just
what ishuman behavior? Sure, you move your hand, that's behavior... but is talking behavior? What
about thinking? After all, neurons are firing when you think, and you can see that in various ways,
these days.

For a very interesting critique of behaviorism, there's always the classic: Chomsky, N. (1967).
"Review of Skinner's Verbal Behavior". Readings in the psychology of language.L. A. Jakobovits and
M. S. Miron. Englewood Cliffs, NJ, Prentice-Hall: 142-171.

Steven Ravett Brown