Tools and resources Tools to help you put the guidance into practice. Audit and service improvement Audit tool Excel 414 KB 16 January 2019 Clinical classification Clinical classification codes PDF 133 KB 16 January 2019 Related news More donor livers could be used for transplantation thanks to exciting new development, NICE says Research recommendations Research recommendations information Guidance into practice About the Into practice guide Practical steps to improving the quality of care and services using NICE guidance