The chairman of Derbyshire Police Authority says she is disappointed the force failed to meet crime-fighting targets this year - despite a 21% rise in council tax funding. Figures released for April to September show officers only achieved targets for reducing vehicle crime.
The research found they failed to meet set targets for preventing burglaries, crime detection and handling emergency calls.
The force says it has now set up working groups to look at improvements.
Recording methods
Violent crime in the county rose by 6%, and robberies were up by 5%.
Derbyshire Police Authority will discuss the figures next week.
Chairman Mrs Jo Thornton has admitted they are disappointing - but says new crime recording methods may be to blame.
The Conservative MP for West Derbyshire Patrick McLoughlin said he wanted to know why the police failed to meet their crime-fighting targets, after two years of large council tax increases.