This is a good reduction of a complex theory of life. We need more. Wondering if you have the exact equations? : D. Like time taken for task = a + e^(-x) ?? What is the value that the curve tends to meet? i need to know for survival 🙂
Access to data for something like this is going to be extremely challenging, and without data, precise equations are extremely difficult. I assume that the general idea of whether it is exponential, linear, or something else is sort of understandable from the graphs themselves. You can always quantify your tasks from the past in terms of effort and impact, and see if you can figure out the curvatures for your project. All the best for your survival!