Ottergirl - the pilots will not have to assess every aspect of a CSDs performance. That's why you have 360 degree appraisal, and use the multiple responses to form a composite view of the individuals overall performance. What they will assess is whether the CSD is proficient in their interactions with the flight crew. Pursers will assess whether the CSD is proficient in working with their peer supervisory grades. Junior crew will give their perceptions of the capabilites of the CSD in leading and motivating junior crew. It all comes through sensibly structured multiple choice questions with an option for explanatory comments. That way you avoid situations where "the feedback I am given is rarely insightful or of any real value". The information can, if necessary, be provided directly to a central collection point rather than returned directly to the individual. Perhaps it has occurred to you that the reason the feedback you have received in the past has been of little real value is not that "our pilots are simply not used to giving feedback outside the cockpit environment" but that the feedback is returned directly to you, immediately, for you to take issue with should you choose to do so?