Scotland skipper Alastair Kellock says his side will have to reduce their error count if they are to progress to the last eight of the World Cup.
The 30-year-old was disappointed with his side's performance in their Pool B opener against minnows Romania on Saturday, in which they had to come from behind to record a hard-fought 34-24 victory.
Scotland started the game well and tries from Mike Blair and Joe Ansbro put them 18-6 ahead but the Romanian pack started to get the upper hand and the Oaks took a shock three-point lead with 13 minutes to go.
But Chris Paterson's penalty levelled the match and two tries from Simon Danielli prevented Romania recording a massive upset.
"We had to come back," he said. "We were in a tough situation with about 10-15 minutes to go but credit to us that we dug it out.
"We made a lot of errors in that middle 40 - and they are errors we need to cut out if we are going to win games in this tournament.
"We dropped a lot of ball, we made a couple of errors with the restarts that we can't afford to do. So simple things but simple things are generally easy to fix.
"To be honest I was disappointed with certain aspects of our game but we got the win, we got the bonus point.
"Our finishing at times was outstanding while our big ball carriers did brilliantly well.
"How we reacted was massive to our World Cup. It was match and possibly tournament defining. But we have to be more ruthless. We made some basic mistakes and lacked urgency at the breakdown."
Head coach Andy Robinson was visibly angry with his side at times during the match and he said afterwards: "Our work ethic dropped off.
"Rugby is a game of momentum and we allowed them to get back into the game. Whenever we scored we gave them a penalty straight back and they stayed in the match.
"We knew what was coming and credit to Romania for the way they played the game. Their scrummaging and mauling was very good.
"The game is for 80 minutes. We had the right attitude for the first 15 minutes. What happened in the next 60 minutes was disappointing.
"But what a finish by our guys. We learnt a lot. It's getting that urgency to the ball and running that bit harder. Those issues will be resolved. We've just got to be a bit tougher in what we do."
Scotland's next game is against Georgia in Invercargill on Wednesday.
Romania coach Romeo Gontineac was unsurprisingly delighted with his side's display, saying: "I am very proud of the performance of our players. I wish we had at least one point in the end but we had nothing. We could today have made history.
"As always we played to our strength and I believe our forwards to be very strong."
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