Thanks, all. Keep 'em coming!
Taking 'content' in the physical way, I came up with this - words like 'length', 'breadth', 'width' already having been taken, I went for some cognates.
The content of IF can be seen along three axes, one of which being
depth, which basically has the same meaning it has in all narrative criticism. The other two together constitute
coverage, which is the product of:
- Longitude - the amount of development during a perusal of the work. One-turn IF has very little longitude, though Aisle has more than Rematch, as the various runs build up more content. Long works do not necessarily have more longitude: an endless search in a huge boring maze doesn't add much in the sense of content.
- Latitude - the amount of spread in development among different choices. Traditional literature or an extremely narrow piece of IF (IF on rails) has a latitude of 1, whereas interesting one-turn IF tends to have a greater latitude. Arguably, again Aisle has more latitude than Rematch, as there is more content to be found by taking various paths. Old CYOA has little latitude, because most choices either merge or lead to instant endings.
Longitude and latitude are like serial and parallel, of course. As for the adjectives,
shallow and
narrow are easy, but 'long' already being taken, I don't know what to use for the longitude adjective.
These terms allow one to speak of 'uneven depth' - where the story is shallower in some places than in others, or more specifically 'uneven lateral depth' - some choices leading to shallower stories, but also of 'uneven latitude', e.g the funnelling phenomenon where at some points the wheel seems taken away from the reader, who suddenly no longer has the freedom enjoyed in earlier parts.