McCarthy's marketing mix is based upon four controllable variables that a company manages in its effort to satisfy the corporation's objectives as well as the needs and wants of a target market. Once there is understanding of the target market's interests, marketers develop tactics, using the 4Ps, to encourage buyers to purchase product. The successful use of the model is predicated upon the degree to which the target market's needs and wants have been understood, and the extent to when the marketers developed the tactics accordingly.