Some contrarian advice for job candidates: don't try to improve your interview technique. If you're genuinely a good candidate, it shouldn't be in your interests to be hired by a company that would be easily fooled by anything so superficial as "good interview technique".
I didn't intend to make "interview technique" and "effective communication" be equivalent. If you're learning "interview technique" then be definition, that's not a general-purpose skill. That's not to say that other general skills won't help; I'm just not talking about them.