How can sole-traders and small time business evaluate the USP of there business and if it directly contributes positively or negatively to sales ?

A S.W.O.T analysis is a widely used decision aiding tool, in a clearer way it can be seen as a tool that helps management professionals make decisions as well as solve problems in there business. This tool looks at all the evaluative qualities of a business, these qualities make up the name of this tool ; Strengths , Weaknesses, Opportunities, Threats these aspects help guide managers onto the basic profile of a business which helps improve the areas that are inflicted. Mostly in my opinion I have found that it is best used when deciding to fix under-preforming sides of the business , as well as give an indication if expansive action is the best option for the future of a business. Hope this answers your question!!