>Progress bar controls typically have an indeterminate flavor too Good point - I was simplifying by referring to all progressive animations as "progress bars"

>Progress bar controls typically have an indeterminate flavor too Good point - I was simplifying by referring to all progressive animations as "progress bars" and all non-progressive animations as "spinners". >indeterminate operations progress too I normally think of "non-progressive" and "indeterminate" as synonymous in this context. If the UI can't tell what fraction of the whole has been completed by any metric (which could even include best guesses based on historical data), I refer to that as non-progressive or indeterminate, interchangeably.