The brewing control chart represents brewed coffee flavor profiles as regions on a chart of Brew Strength and Extraction Yield. The chart is divided into nine regions based on specified lower and upper limits for each variable. The vertical axis corresponds to Brew Strength measured in total dissolved solids (TDS) and Extraction Yield measured in mass concentration of dissolved coffee solids. These two specifications overlap to produce a box in the centre of the chart that indicates the most desirable cup of filter coffee. Each coffee of the Extraction Methods defines different “ideal” regions on the chart.