Tory frustration with the slow progress on appraisal over six years was compounded by annoyance that the Pounds 30 million allocated in the first four years of the scheme appears to have been spent on other things.
Another Pounds 8 million had been set aside for appraisal training, the Scottish Office estimated.
But a report published last year by the Office for Standards in Education concluded that the Pounds 50 million spent on appraisal in England had effectively been a waste of money. It had improved teaching in only a fifth of some 300 schools visited by inspectors.
The report stated: "There is too little evidence that appraisal is contributing as much as it should to raising pupils' standards of achievement and to improving teachers' levels of performance."