I am currently working on a framework for evaluating the usability of our products against our product design principles, which are nothing more than 10 usability heuristics (N & A). N) expressed in our own words. The goal is to identify areas of use that we do not achieve the best. That said, we have 8 heuristics covering specific usability areas. There will be a checklist in each of the heuristics to evaluate and in the end we will have a percentage as a score for each.
My question is, how do you know what each score means? Is 70% good or bad? How to define the threshold? Also, how do you weight each of the heuristics in order of importance? It is surely more important for a website, that is, to always provide feedback on the system and in a timely manner rather than looking good.
I wonder if you have any advice? I hope all this makes sense. Thank you