Thanks to Raymond Ward’s the (new) legal writer here is an article about brief (motions?) writing.
Prof. Ken Chestek of the Indiana University School of Law recently conducted a study, trying to determine empirically whether a brief with an element of storytelling is more persuasive or less persuasive than a purely logical, law-driven brief.
He published the results of his study in an article that you can download here. Although (as Prof. Chestek acknowledges) the sample size may be too small to draw definitive conclusions, the study’s results suggest that storytelling makes for a more persuasive brief.