It might even be worse still since this model (seems I may be wrong) to assume that the probability of a usability bug is constant, it might be that the share of bugs discovered by users is skewed towards the first few such that the first user finds more than the formula would predict.
It's certainly been my observation that cynical developers who test things as they go by deliberately putting in silly things into stuff they just wrote seem to get hung up less in testing.
I mean the system I inherited at work the first thing I did when I got an instance spun up was put in a negative value in the quote line quantity (which immediately broke..well almost everything) then decimal values in quantity fields where only integers made sense, then text in number fields and so on each time breaking something in a new and interesting way.
Sometimes I think it's hard not to be cynical about enterprise systems.
My old lecturer (somewhat pithily) "Almost all the testing in the world means nothing compared to 15 minutes in the hands of the 17 year old office junior"
It's certainly been my observation that cynical developers who test things as they go by deliberately putting in silly things into stuff they just wrote seem to get hung up less in testing.
I mean the system I inherited at work the first thing I did when I got an instance spun up was put in a negative value in the quote line quantity (which immediately broke..well almost everything) then decimal values in quantity fields where only integers made sense, then text in number fields and so on each time breaking something in a new and interesting way.
Sometimes I think it's hard not to be cynical about enterprise systems.
My old lecturer (somewhat pithily) "Almost all the testing in the world means nothing compared to 15 minutes in the hands of the 17 year old office junior"