This document provides an in-depth understanding of variance in assessing performance and decision making in management accounting. It covers topics such as sales price variance, sales volume contribution variance, material price planning variance, material price operational variance, and the merits and demerits of using variance in assessing manager performance. The document also includes a case study on XLG, a cleaning product company, and discusses the competitive advantage of FamaQ and the increasing demand for chemical X and Y.