The performance ratings system provides a high level overview of National Health Service Trust performance across the full range of trust functions. Acute and specialist, mental health and ambulance trust performance indicators are based around capacity and capability, clinical and patient focus including attainment of key targets. Primary care trust performance is assessed across the full range of primary care trust functions: service provision, access to quality services and improving health and attainment of key targets. The 2003 performance ratings contain a number of indicators, which relate to specialised services across all NHS Trusts with the exception of ambulance trusts. These include the reduction of waiting times for cancer services, 24-hour access to specialist mental health services and expansion of revascularisation services.