CRAIG Cathcart had a horrific start to his Argyle career in the dismal 2-0 Carling Cup defeat at Luton Town in August.
Manager Paul Sturrock was quick to inform the young defender on loan from Manchester United of what was needed to survive in the Championship.
He was recalled to the team for the win at Watford a fortnight ago and he has since formed a solid partnership with Marcel Seip in Argyle's recent run of 10 points from a possible 12, and is likely to be involved in tomorrow's meeting with Sheffield Wednesday.
"He has done ok," said Luggy. "He has put a partnership together, which was vitally important at the time.
"He and Marcel have done very well together and I am quite happy. He is developing in the right direction.
"He is a Manchester United player, so you know he has a modicum of skill and ability on the ball.
"I am honing his development now on the strength factor and the aerial threat in this league, and he has adapted very well. He is 19-years-old and he has not let us down in any way.
"The good thing about people from Manchester United is that you tell them something once and you don't have to tell them again, which is why they are at Manchester United.
"I talked to him after the Luton game about upper body strength, the battle, power and pace of the league, and he has never looked back."