Something has been irritating me: The startup community uses the words assumption and hypothesis interchangeably.
We also rarely use hypothesis correctly, often referring to laughably vague statements as hypotheses such as this gem I overheard:
Our hypothesis is that a $50k seed round will be enough to show traction.
I do the same damn thing, hence my irritation. So we should stop doing that, because it has an OVERSIZED effect on our next decision for our startup.
tl;dr: Assumptions should be challenged and clarified with research. Falsifiable hypotheses should be tested with an experiment.
Bonus: I'm writing a more complete version of how to design great experiments as an open source "Real Book", you can get on the download list here: