There is also an out of date 3 page PDF file (26 November) with suggestions for a grid (or matrix) of requirements, and first draft (empty) grid.
Note: initially we referred to this as a 'Requirements Matrix', then later discovered that that phrase has a different meaning in the engineering community, where it refers to a way of displaying priority relations between requirements, whereas we are talking about different component requirements that can be combined in different complex sets of requirements.