I have sat on a number of public service interview boards over the years and, while it is true that those in some organisations are well trained, some I've been with have left a lot to be desired. The last interview board I sat on was approx. 3 years ago, so its not that long ago. I found that a good proportion of the internal people on some of the boards did not have any formal training, were not familiar with public service guidelines and tended to take into account things from outside the interview. Sometimes a candidate would give a good interview, but during the assessment discussions, it becomes clear that the internals have something against the candidate. I've also seen situations whereby the internals mark a particular candidate much higher than their interview performance merits and justify it with comments like ".....I know candidate X.....I think s/he just had a bad day and gave a poor interview...". The worst thing I ever came across was one interview board where the internal interviewers had notes on all the candidates - based on canvassed feedback - on the table while interviewing the candidates. Needless to say the resulting panel look very different to the performance of the candidates. I have complained about this stuff, but its difficult to prove. The only record of a candidates performance is often a few lines of paraphrasing of what the candidate says in an assessment box along with some bland comments by the board. Without tape recordings or any other proof, how is any candidate to know how s/he did relative to the others?
My experience was that the type of competitions with loads of candidates, large panels, multiple boards tend to be the fairest. Those where the candidates all work in a small organisation and all know each other tend to be the worst.