I would like to test how 2 different fonts (mostly for numbers) would affect performance of operations team. At the moment I have a hypotheses: "By changing font from A to B cognitive load of ops team will increase resulting in errors/slower performance"
And I will measure errors and time on task. Also ask them to provide some qualitative feedback about the use of the system. I have access to at least 5 people that are actually using the product. And are able to provide me with feedback.
Is this a correct approach? Or is there a better way of testing for small changes like font and how it impacts performance