To ask the Chancellor of the Exchequer what methods HM Revenue and Customs uses to measure the effectiveness of its service to tax credit claimants. (283511)

HM Revenue and Customs uses a range of methods to measure the effectiveness of its service to tax credits claimants. The key ones are explained in HMRC's Business Plan for 2009-10 'Delivering our Vision' available at

http://www.hmrc.gov.uk/about/business-plan-vision.pdf