The AICPA Audit Guide Audit Sampling, updated as of March 1, 2012, including the Clarity Project, summarizes applicable requirements and practices, and delivers "how-to" advice to help auditors apply nonstatistical and statistical sampling in auditing. The guide includes case studies illustrating the use of different sampling methods, including classical variables sampling and monetary unit sampling, in real world situations. The appendices include sampling tables and testing considerations.