The government should update Parliament four times a year on progress towards meeting its goals for Iraq, shadow foreign secretary William Hague said.
"We must also ensure that we understand the benchmarks of failure and success and heed the warnings that have been issued," Mr Hague said.
The US had "much more willingness to subject its strategy to both democratic oversight and public debate", he said.
He also called for Syria to be included in "constructive engagement".
The shadow foreign secretary, in a wide-ranging speech to the Global Strategy Forum, said Syria should be included in talks on the middle east because it "has an impact on all the region's major issues".
He said the government had "set out a plan for the reduction of British troops in Iraq and the handover of all four provinces in the British area to Iraqi control during the course of the year".
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