Effectiveness is the level of results from the actions of employees and managers. Employees and managers who demonstrate effectiveness in the workplace help produce high-quality results. Take, for instance, an employee who works the sales floor. If he’s effective, he’ll make sales consistently. If he’s ineffective, he’ll struggle to persuade customers to make a purchase. Companies measure effectiveness often by conducting performance reviews. The effectiveness of a workforce has an enormous impact on the quality of a company’s product or service, which often dictates a company’s reputation and customer satisfaction.