Choosing a move

http://www.chess.com/article/view/what-does-dorfman-has-to-say-on-planning

In the strategy section

http://www.chess.com/articles/strategy

This great article by 'energia' describes I.Dorfman's 'The method in chess' with examples putting the theroy into practice.

In summary :

1. Whose position is better (a) king position, (b) material balance (c) whose position is better if you take off the queens (a central active king becomes an advantage) (d) best pawn structure.

2. If you're better off play for slow static advantages. If you're worse off aim to bring pieces together/exchange to take the energy out of the position

Other gem - A fixed pawn structure benefits the side with a knight over the side with a bishop.