Stable income: Somewhat stable

I’d rate it a 3 out of 5 because while usability testing can provide a decent baseline income, it is not entirely reliable. There are periods when tests are abundant and others when they are scarce, leading to fluctuations in income. It’s not as unpredictable as a 2, where income is highly volatile, but it lacks the consistency of a 4, where most months would be similar and predictable.