This is an article by Ross W. Duffin about Just intonation in Renaissance music. I would use the section of this essay entitled "New Approach" when working with an ensemble performing Renaissance music. I would use the Problematic Solutions strategy in this situation by giving the students the situation of having to make difficult decisions about intonation in a period ensemble. They would think about that scenario as they read the essay and use it to inform their own performance.
Field of just intonation. The presence of the Syntonic Comma interval (11 schismas in size), and the Ditonic or Pythagorean Comma (12 schismas in size), leads to a natural resolution of the field of Just Intonation into a scale of Commas, if we temper into the closed cycle of 53-ET. This great system of temperament can rightly be named Quasi-Just Intonation since it preserves so many of the essential properties of pure Just Intonation within a reasonably manageable complexity.