$2\mathrm{.}1$ SDZ engineering consultancy, a mid$-$sized manufacturing company based in South Africa, looking to adopt a standard data system $($SDS$)$ for machining operations has appointed you as a work study consultant. Draft a high$-$level plan to classify work elements for milling and turning operations. Include at least $3$ examples per operation and justify the classification. $2\mathrm{.}2$ Elaborate on the characteristics and requirements of work environments that are best served by employing standard data system