While most companies focus efforts on improving supply chain efficiency by looking at the supply chain process itself, a few realize that other departments can have an impact on efficiency and speed. One of these departments is quality, which is tasked with inspecting incoming raw materials, in$-$process work and final product before it is shipped. If there is a way to help the quality department get its job done faster, then, by definition, the operations process can move along faster, thus reducing time in the supply chain. With this regard,

$1\mathrm{.}1$ Explain the role of Six sigma on improving quality. $(10)$

$1\mathrm{.}2$ Discuss the uses of ishikawa tool on improving quality.