Multi-vari is treated as a pre-experimentation technique to isolate and quantify the major components of variability - temporal, cyclical and positional variation. The book presents a method for analysing multiple variables at the same time, without manipulating the variables. It follows a step-by-step process of describing how to implement Multi-vari charts in a manufacturing process. It details how to statistically analyze Multi-vari data and decompose the variance to obtain the variability of each variable independently. Case studies in semiconductor, medical device, printed circuit board and automotive applications are provided.