I'll preface this post by saying what I often say in class - "Technique is like medicine. You only use it when you need it." If you're feeling the emotions you need to feel by simply believing in the imaginary circumstances, then you don't need anything else. It's working. But often times (especially after 15 takes) an actor might have trouble generating the real emotion he or she needs to feel in the scene. Typically, this is when they start "indicating" the emotions required in the scene (see my August 14th blog).
The preventative medicine to this common problem can often be found in the actor's preparation. I suggest two phases of prep before an actor enters a scene (or the director calls "Action"). When both are used together the actor feels what he needs to feel and starts the scene anchored in the imaginary circumstances. Here's how it works:
Step 1. Get emotionally full.
...Which I'll post in a few days, so check back soon! ;)