Quality Assurance is the collection of measures to judge the reliability of the data collected in everyday practice. It addresses the analyst engaged in the daily operations as well as the laboratory superviser and the quality manager. This topic currently covers basic statistical tests, the determination of validation parameters, and various options for quality control in daily operations. We will expand this topic in the direction of your choice. I invite you to mail me your expectations and suggestions for this Topic, plus any corrections, comments or practical tips for the articles.