Half of the government's systems for tracking its public service agreement progress are not fully fit for purpose, a report concludes.
The National Audit Office says difficulties have been experienced transferring improvements in existing systems to new ones.
It says one percent of data systems had not been established at all while eight per cent were fully unfit for purpose. Thirty-five percent were broadly acceptable but needed strengthening.
"Good quality data are essential if performance measures and targets are to be used effectively to improve public sector delivery and accountability," NAO chief Sir John Bourn said.
Conservative shadow chief secretary to the Treasury Philip Hammond said the report explained why "so much public money had been wasted" under the Labour government in the last 10 years.