When you have about twenty minutes to make your mind up Jim , and a lad has made no effort to present himself at all , I certainly never worried about anyone wearing a suit and certainly never bothered about a tie , but regarded that if you were discussing what could be your future a bit of effort for the interview could indicate that I might , in the case of apprentices get effort to learn . Shuffle in with hands in pocket and call the interviewer "mate !" Look disinterested , and use the F word quite a bit , or tell me like one lad did , that he had been sacked from his last job , because his boss was a knob , then you in a competitive environment , have a harder hill to climb . My point was that the best qualified lad was not always the best candidate , for apprentices or fitters or electricians . One of my biggest mistakes had a HNC and was a MENSA member , I sincerely believe , politeness and effort for the interview give an initial impression that eases the first five minutes . That five minutes will give you a good idea as to what you need to ask in the next fifteen . In forty years in management I only had to see one person go , for drinking at work , so felt as uncouth as my style might have been it worked for me, although I confess to having no formal personnel qualifications