Personal selling involves an oral presentation given by a salesperson who approaches an individual or a group of potential customers. Personal selling allows for two-way communication and relationship building that can aid both the buyer and the seller in their goals. Personal selling is most commonly seen in business-to-business marketing (e.g.: selling machinery to a factory, selling paper to a print shop), but it can also be found in business-to-consumer marketing (e.g.: selling cars at a dealership). 
Marketing strategies should ideally have longer lifespans than individual marketing plans because they contain value propositions and other key elements of a company’s brand, which generally hold consistent over the long haul. In other words, marketing strategies cover big-picture messaging, while marketing plans delineate the logistical details of specific campaigns.
The functional level relates to departments within the SBUs, such as marketing, finance, HR, production, etc. The functional level would adopt the SBU's strategy and determine how to accomplish the SBU's own objectives in its market. To use the example of the sports goods industry again, the marketing department would draw up marketing plans, strategies and communications to help the SBU achieve its marketing aims.
However, identifying the right strategies to market your business is often likened to rocket science. How do you get your message to the right audience and do it effectively? How do you boost visibility and increase sales while sustaining a profit with a converting offer? Today, with so much vying for our attention from social media, to search engine optimization, blogging and pay-per-click advertising, it's easy to see why most are ready to pull their hair out.
The vision and mission address the second central question, 'Where are we going?' At the conclusion of the research and analysis stage, the firm will typically review its vision statement, mission statement and, if necessary, devise a new vision and mission for the outlook period. At this stage, the firm will also devise a generic competitive strategy as the basis for maintaining a sustainable competitive advantage for the forthcoming planning period.
Selling: Determine where and how you plan to sell to customers. Consumer product companies, for example, sell to wholesalers who then sell to retailers. In the industrial market, the buying process is longer and involves more decision-makers. You may sell locally, nationally, or even internationally, and some companies only sell their products or services online. Your distribution and sales channels impact who buys your products, when they buy them, and how they buy them.
^ Fisk, R.P., Brown, W., and Bitner, M.J., "Tracking the Evolution of Services Marketing Literature, Journal of Retailing, vol. 41 (April), 1993; Booms, B. and Bitner, M.J. "Marketing Strategies and Organizational Structures for Service Firms" in James H. Donnelly and William R. George (eds), Marketing of Services, Chicago: American Marketing Association, 47–51; Rafiq,M. and Ahmed, P.K. "Using the 7Ps as a Generic Marketing mix: An Exploratory Survey of UK and European Marketing Academics", Marketing Intelligence & Planning, Vol. 13, no. 9, pp. 4–15
Diversification is the riskiest area for a business. This is where a new product is sold to a new market. There are two type of Diversification; horizontal and vertical. 'Horizontal diversification focuses more on product(s) where the business is knowledgeable, whereas vertical diversification focuses more on the introduction of new product into new markets, where the business could have less knowledge of the new market. FREE Digital Marketing Course