|Since the accuracy and honesty of the survey depends totally on anonymity, defend it! The process must ensure that all responses are anonymous (except the manager's manager(s) - and even that person has been known to want to hide!) and the people involved must take it very seriously. Any loss of anonymity or even just the threat of exposure will greatly reduce the value of the survey.
Simple things can lose anonymity, here's an example: a manager has staff absent and can only get, say 3 responses. The profile is produced and given to them with averaged data only. Another staff member returns and wants to put in his/her response. No! It can't be anonymous, it's easy to work out what's been added. So you ask them "Do you mind not being anonymous?" "Of course not" s/he replies but what else could they say? A "Yes" would make their position rather obvious. So now they will have to play it safe if they feel under threat.
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