I think that going to Kodak's (like
@Anon Ymous suggests) and Ilford's documentation, is your best option, unless you're willing to do your own testing. I will quote Henry (1988), who said this regarding your question:
"I wish I could give you exact answers as to what these terms mean in a quantitative way (...) but this is impossible simply because the time adjustments required vary between films, developers, and various authors." (p. 155). He said that after a thorough review of some of the work on the subject, pointing out their similarities and differences.
I ran a calculation just now, and, if you wanted to be reasonably thorough, for one film, one developer, one development procedure combination, you are talking upwards of 2280 different options, and that's without taking into account any arbitrary factors, such as those by Adams:
"Normal development is an arbitrary value depending on (a) personal concepts of values, (b) transmission factors of the lens and shutter, (c) character of the negative diffuse or condenser (collimated) light, (d) character of the developer, (e) method of printing, (f) type of printing paper to be used, - photography is a fluid procedure, not a rigid and mechanically limited craft."
You could reduce that number a bit, by limiting the subject luminance range and the range of film contrast you are most interested in, but, even then, this would be a huge number.
The most sensible, simplest approach I've found is the "15/50" model by Hicks and Schultz (1997). It bypasses most of the theory and gives one a very manageable model to work with. You can argue that it's not accurate, and perhaps it's not, but it is very easy to implement by anyone.