In his book, Story, Robert McKee explains that the controlling idea of a story delivers to readers and audiences the true theme or ethical judgment of the tale—what the story is really about.

For writers, the controlling idea can help us keep the story on track by shining a spotlight on what actions and events to include or exclude from the story—actions and events that stay or stray from the intended path. 

We‘ve talked about this controlling idea before, but under the nomenclature of The Moral Premise. What I like about McKee’s use of the phrase is the reminder that the story has to be constantly steered towards its destination. 

McKee defines the controlling idea as having two components: Value and cause. Value identifies the positive or negative charge that arises as a result of the 3rd act’s climax. Cause gives the reason for this outcome. Value and cause, therefore, provide the central meaning of the tale.

“The controlling idea serves to keep your story on track.”

Because value can have a positive or negative charge, the outcome of the controlling idea, the value judgment, can only be delivered to the reader or audience at the end of the story. Importantly, though, the result has been prepared for by a series of actions undertaken by the protagonist in pursuit of his goal. The result of the climactic battle between the antagonist and protagonist towards the end of the third act delivers the writer’s final judgment on the moral or ethical status of the story. In the words of McKee, ‘value means the primary value in its positive or negative charge that comes into the world or life of your character as a result of the final action of the story.”

The final value, therefore, whether positive or negative, is the hard fought-for point of the entire tale.

In an up-ending crime story such as In the Heat of the Night, the writer’s judgment on the final value, might be: That even in a corrupt world (negative charge), it is possible to have justice restored (positive charge) through righteous and persistent action.

In a negatively charged love story-ending such as Dangerous Liaisons the controlling idea leads to a negative outcome: That passion, naively directed, leads to self-loathing and death.

All this sounds remarkably like the moral premise.

Summary
The controlling idea is the ethical or moral point of the story. Scenes containing actions and events that stray from the path should be eliminated.

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