The sample size is 18,000+ respondents roughly 55% of staff.
Is that a pretty big response for a staff survey? There are people on here with more knowledge of such things, but if 18,000 staff actually took the time to complete the survey it sounds like the workplace is much more passionate than the usual ACME Inc. 'tell us what you think' wankathon where you're lucky to get a 25% return (even when there are prizes
).