We used to drum it into test technicians - if something weird happens, then measure the amount of weird... I think it was Bob Pease (a name known to just about every electronic engineer on the planet, but sadly no longer with us) whom I heard it from first.
[Janeway]Time travel gives me a headache.[/Janeway]
And one time, it was Paxans.
And sometimes it's the Borg because of Q.
If I've learned anything from watching every episode of every ST series multiple times... it's that time seems wonky you scan for temporal anomalies. (You're looking for unusual tachyon readings! Usually it's the Borg. Sometimes it's Q.)