At XPRIZE, it is a cardinal sin to presume to know how to solve the problem. We are careful in our prize design to bound the problem space so it is achievable, but not bound the solution space. We don't know the best way to solve a problem posed by an XPRIZE - that's why it's an XPRIZE.
My 100-meter sprint analogy wasn't a very good one, but I think there is an excellent one - an admissions application to a competitive college. Once you're enrolled in a college, the criterion for becoming valedictorian is clear, quantitative, and easy to understand from the outset. You do have to do better than everyone else, and you know up front exactly how you will be scored.
But being admitted in the first place is much less clear. You have to convince the admissions office that you are likely to succeed at that college and fit in well with their goals for the incoming class. There are standard items considered by the judges - high school GPA, standardized tests, on-campus and alumni interviews, extracurricular activity, etc. - but you can generally submit anything you want if you think it will persuade them. And no one can tell you a specific combination of inputs that will get you admitted. You may have a poor GPA and done volunteer research that cured a devastating disease. You might do poorly on standardized tests but have a good GPA and write an incredible essay. You might be a gifted composer and submit a symphony score, something the application never suggested you might submit. Any one of those might get you admitted. Poor performance on or omission of any one item (good GPA, extracurricular work, etc.) might exclude you from the list.
You might say, "OK, but there are some absolute necessities, like a high school diploma." No, the school I attended (Dartmouth College) and many others (Harvard, MIT, etc., etc.) don't require it. It's highly recommended and a very good thing to have, and not having one makes your job much harder. But at the end of the day you have to persuade the admissions committee that you're a good fit for the college by providing them sufficient evidence.
For the Adult Literacy XPRIZE, your job is to provide the judging committee with sufficient evidence that your approach is a good fit for the problem being addressed. You have to persuade them that your solution is one of the five most likely to succeed in the field test (where, like the competition for valedictorian, the criteria are unambiguous because it's entirely under the sponsor's oversight). You may take an incredibly unconventional approach that looks bizarre. That might not impress the judges. But if you accompany it with a video showing testers using it, and actual test statistics showing results, you might impress them a lot. Do you have to support iOS users? No, but if you don't (like not having a high school diploma) you've made your job a lot harder.
You're trying to persuade a jury, just as if you're an attorney in a courtroom. There are guidelines, but there's no recipe or formula that tells you how many words you need to devote to making your client look sympathetic. You just have to decide what you think the best approach is, and do it as well as you can.