3.3 Selecting Sample Sizes The purpose of any measurement study is to understand the properties of the measurement system. 3.3.1 A sufficient number of samples should be selected to cover the expected operation range. 3.3.2 Must weigh in the risk of having defective material flow through the operation. Higher risk will warrant a higher sample size. 3.3.3 For all new parts and assemblies, TSL requires a standard 10-3-3 test; ten parts, 3 appraisers and 3 trials. 3.3.4 For any re-certifications or minor changes to a part number, the GR&R can be re-certified using a 5-3-3. Further details are covered in Section 3.2.2. 3.3.5 TSL requires a minimum of 2 appraisers for any MSA study