Internal Technique

Imagination

Imagination is like fuel for an artist. I said artist, not actor because any kind of art it is painting, writing, acting, dancing, or anything, it thrives on imagination. The story, characters, place, props, everything on stage or set is imaginary or make-believe. The actor has to imagine that whatever circumstance the writer has offered is true. It was not just Stanislavski but other methods like Uta hagen’s method is also a great advocate of imagination. 
Stanislavski offers you a great tool to imagine anything. The tool is called “if”. Imagine you have to storm out of a room and slam the door behind because you are angry with your wife or husband. You have to imagine a relationship with another actor because the other actor is not your real wife or husband or the so-called room is just a wall and the door in the middle and open on the other three sides.
Stanislavski’s acting techniques teach how to have a good imagination. To be a have a good imagination, you must be a good observer. Observe everything that surrounds. Try to remember each and every detail about it. Be it a person or a thing, just imprint its image on your mind. Create a bank of it. And when you imagine, make sure you provide some motive to it. Imaginations are like inward actions, hence they are must have a motive. First, be a spectator to it, when you are familiar with it, be a part of it.

Attention

A major problem actor face is where to look, or where to focus. To address this issue Stanislavski’s method of acting offers several tools to the actor. He describes in his book, An Actor Prepares, that an actor must have a point of attention. This will not only help actor to stay in the scene but also takes the actor’s attention away from the audience or camera or the crew.
An effective technique is to create a circle of attention. This attention can be created by using the objects in the room or the light. During the scene, try to restrict the circle only to the necessary area. Whenever a circle gets out of control, bring it back to the objects or focused light that you had marked as your circle of attention. Even while moving, carry this circle of attention with you.
Another major issue that freaks out the actor is the audience or the camera. Creating an invisible wall, which in acting terms is called the fourth wall, using your attention will help you stay focused on the action that you have to do. Read the scenes carefully, they always offer good insight on where the actor is looking, using that you can create your point of attention or circle of attention.
If you want a very useful acting tool to develop character for your gig, I recommend you to checkout my worksheet 100 Questions To Build An Living, And Breathing Character In An Hour.