I have updated my page on How to Write an Outline to reflect my growing preference for decimal rather than alphanumeric outlines. Alphanumeric outlines repeat letters and numbers, so the reader must flip back and forth to figure out if a point labeled “3” is II.B.3 or III.A.3. Decimal outlines solve this: it’s always point 2.2.3. Also, decimal outlines offer an easier check on an overgrowth of points. Rather than tell students they may not use letters and numbers higher than V, E, 5, e, etc., I can simply tell them to write the outline without any digits over 5, anywhere in the structure.
I have also removed the reference to The Craft of Research, since the 4th edition does not include the useful advice that appeared in the 3d. In its place, I refer readers to the Purdue OWL page on Types of Outlines and Samples. And I’ve changed the way I outlined Wells’s introduction.
I’ve kept the old version online for fans of Roman numerals.