At the end of last season an incredible 11 boys were kept on and promoted to Colin's reserve side, while a further seven will graduate this year. Only two of the 11 retained - John Sutton and Walter Thomas - departed over the course of the season, meaning a particularly healthy return from the group.
"It is, but some of them had contracts that ran beyond this year so decisions did not have to be made on all of them," said Colin.
"But as soon as they got that contract it was stressed to them that they don't have until next June or July to make an impression - it starts now.
"They can't think they've got until Christmas because by that time it is too late. Whatever they've done in that time is left in our minds and will have a big bearing on what we do.
"It is ruthless but I think as soon as they get that contract I feel we expect more of them. They've earned another contract so we demand more of them and expect them to be more professional.
"Their application to training has got to be more concentrated on and what they do away from the field has got to be more mature.
"Get away from all the daft things they might be used to doing and start to grow up."
THE CALDERWOOD FILES:
Part One - CLICK HERE
Part Two - CLICK HERE
Part Three - CLICK HERE
Part Four - CLICK HERE
Colin Calderwood agrees that it is a credit to the system that so many Academy boys are retained by the club - but insists they have no time to dwell on their achievement.