High Quality Content by WIKIPEDIA articles! Sales process engineering has been described as the systematic application of scientific and mathematical principles to achieve the practical goals of a particular sales process". Selden pointed out that in this context, sales referred to the output of a process involving a variety of functions across an organization, and not that of a sales department alone. Primary areas of application span functions including sales, marketing, and customer service. Variations of this brief description are possible, but described as such, the discipline is consistent with other published definitions of engineering and its many well-established branches, but relatively new in its focus.