A diagram of Michail Porter's Five Forces based on an image from Porter M. E., Competitive Advantage: Creating and Sustaining Superior Performance (New York: Free Press, 1985), page 5
Source: Porter's Five Forces AnalysisThe Porter model involves scanning the environment for threats from competitors and identifying problems early on to minimize threats imposed by competitors.
Source: Boundless. “Conducting a Situational Analysis.” Boundless Marketing Boundless, 26 May. 2016. Retrieved 01 Feb. 2017 from https://www.boundless.com/marketing/textbooks/boundless-marketing-textbook/marketing-strategies-and-planning-2/steps-to-creating-a-marketing-plan-28/conducting-a-situational-analysis-151-7221/