David Mamet wrote a “Master [writing] Class Memo” to his writers on the show The Unit a few years back. Much of what he presents applies to novelists just as easily as screen writers:
EVERY SCENE MUST BE DRAMATIC. THAT MEANS: THE MAIN CHARACTER MUST HAVE A SIMPLE, STRAIGHTFORWARD, PRESSING NEED WHICH IMPELS HIM OR HER TO SHOW UP IN THE SCENE.
THIS NEED IS WHY THEY CAME. IT IS WHAT THE SCENE IS ABOUT. THEIR ATTEMPT TO GET THIS NEED MET WILL LEAD, AT THE END OF THE SCENE,TO FAILURE – THIS IS HOW THE SCENE IS OVER. IT, THIS FAILURE, WILL, THEN, OF NECESSITY, PROPEL US INTO THE NEXT SCENE.
ALL THESE ATTEMPTS, TAKEN TOGETHER, WILL, OVER THE COURSE OF THE EPISODE, CONSTITUTE THE PLOT.
ANY SCENE, THUS, WHICH DOES NOT BOTH ADVANCE THE PLOT, AND STANDALONE (THAT IS, DRAMATICALLY, BY ITSELF, ON ITS OWN MERITS) IS EITHER SUPERFLUOUS, OR INCORRECTLY WRITTEN.
And most importantly:
I CLOSE WITH THE ONE THOUGHT: LOOK AT THE SCENE AND ASK YOURSELF “IS IT DRAMATIC? IS IT ESSENTIAL? DOES IT ADVANCE THE PLOT?
ANSWER TRUTHFULLY.
IF THE ANSWER IS “NO” WRITE IT AGAIN OR THROW IT OUT.
Does every scene of your story propel it forward or will readers feel like they are bogged down in a swamp?
And on 
Darrick Dean 