The marketing plans for an organisation, such as IKEA, are only effective for a limited period and must be reviewed and changed if the business does not prosper. The three elements of segmentation, targeting, and positioning are crucial for the growth of an organisation. Segmentation involves identifying specific segments or sectors of customers who are interested in buying the products, targeting involves fulfilling the demands of these customers, and positioning provides an idea about where to find the products easily. Controlling is also important, as it involves monitoring the process through customer feedback and evaluating the success of marketing plans through profit metrics.