Calling a Good Task

All of this banter about classes, and what's fair or not for a class, leads me to a couple of questions. Now, please understand that I am not a competition pilot so forgive if I sound a bit naive. I have been doing a little online research but don't find a lot of information...or I'm looking in the wrong place!

First, what constitutes a good task? Is there an established set of criteria used when evaluating weather, site, and aircraft?

Second, has there been any effort to programmatically "call" a task based on a set of criteria?...like the above mentioned factors. I don't believe you can substitute good human judgement with a set of executable instructions ...but it may be helpful to use technology to assist with task calling given what seems like a very complex set of variables. Who knows, maybe the task caller could do some sort of Monte Carlo simulations for a task, given all the variables, and have results showing the probability of success for a number of potential tasks!

Any thoughts? How about references on task calling?

Brad A.