| Too many emotional and stereo type preachings/ replies (probably posted by members who have short span of working experience of facing such situations.
ritedarong has put it correctly.
My experience and understanding says that initial period of probation has more responsibility on candidate to prove his suitability to actual job requirements. This is the period where HR and Operational Boss has full responsibility to facilitate this process of induction training.
While saying above in my opinion if Management (to be specific his Boss, who is on the job trainer) discovers any lacuna in his conduct, character or capabilities, they should be prompt in taking a decision of shunting the fellow out. Rest all dept. (including HR) should not be much considerate at this juncture and facilitate the decision.
However if immediate Boss fails to identify any negatives in first 3 months and suddenly he says fire the trainee, than Boss should be taken to task..............
Above is transparent method which put positive pressure on both the parties and usually outcomes are positives only. | 
