G eneral Guidelines for a Control System of Production Homogeneity

The guidelines for controlling production homogeneity are made up of the following two parts:

• Control of compliance with a recipe, accomplished by establishing an oper­ation compliance level (OCL), which is a variable index that estimates the production accuracy and indicates the appropriate mixture test frequencies

• Control of production variability through determining a running mean of the deviation from target (i. e., from a recipe).