In a ranking method system (also called stack ranking), employees in a particular department are ranked based on their value to the manager or supervisor. This system is a comparative method for performance evaluations. The manager will have a list of all employees and will first choose the most valuable employee and put that name at the top. Then he or she will choose the least valuable employee and put that name at the bottom of the list. With the remaining employees, this process would be repeated. Obviously, there is room for bias with this method, and it may not work well in a larger organization, where managers may not interact with each employee on a day-to-day basis.
To make this type of evaluation most valuable (and legal), each supervisor should use the same criteria to rank each individual. Otherwise, if criteria are not clearly developed, validity and halo effects could be present. The Roper v. Exxon Corp case illustrates the need for clear guidelines when using a ranking system. At Exxon, the legal department attorneys were annually evaluated and then ranked based on input from attorneys, supervisors, and clients. Based on the feedback, each attorney for Exxon was ranked based on their relative contribution and performance. Each attorney was given a group percentile rank (i.e., 99 percent was the best-performing attorney). When Roper was in the bottom 10 percent for three years and was informed of his separation with the company, he filed an age discrimination lawsuit. The courts found no correlation between age and the lowest-ranking individuals, and because Exxon had a set of established ranking criteria, they won the case. 1
Another consideration is the effect on employee morale should the rankings be made public. If they are not made public, morale issues may still exist, as the perception might be that management has “secret” documents.
Fortune 500 Focus
Critics have long said that a forced ranking system can be detrimental to morale; it focuses too much on individual performance as opposed to team performance. Some say a forced ranking system promotes too much competition in the workplace. However, many Fortune 500 companies use this system and have found it works for their culture. General Electric (GE) used perhaps one of the most well-known forced ranking systems. In this system, every year managers placed their employees into one of three categories: “A” employees are the top 20 percent, “B” employees are the middle 70 percent, and “C” performers are the bottom 10 percent. In GE’s system, the bottom 10 percent are usually either let go or put on a performance plan. The top 20 percent are given more responsibility and perhaps even promoted. However, even GE has reinvented this stringent forced ranking system. In 2006, it changed the system to remove references to the 20/70/10 split, and GE now presents the curve as a guideline. This gives more freedom for managers to distribute employees in a less stringent manner. 2
The advantages of a forced ranking system include that it creates a high-performance work culture and establishes well-defined consequences for not meeting performance standards. In recent research, a forced ranking system seems to correlate well with return on investment to shareholders. For example, the study 3 shows that companies who use individual criteria (as opposed to overall performance) to measure performance outperform those who measure performance based on overall company success. To make a ranking system work, it is key to ensure managers have a firm grasp on the criteria on which employees will be ranked. Companies using forced rankings without set criteria open themselves to lawsuits, because it would appear the rankings happen based on favoritism rather than quantifiable performance data. For example, Ford in the past used forced ranking systems but eliminated the system after settling class action lawsuits that claimed discrimination. 4 Conoco also has settled lawsuits over its forced ranking systems, as domestic employees claimed the system favored foreign workers. 5 To avoid these issues, the best way to develop and maintain a forced ranking system is to provide each employee with specific and measurable objectives, and also provide management training so the system is executed in a fair, quantifiable manner.
In a forced distribution system, like the one used by GE, employees are ranked in groups based on high performers, average performers, and nonperformers. The trouble with this system is that it does not consider that all employees could be in the top two categories, high or average performers, and requires that some employees be put in the nonperforming category.
In a paired comparison system, the manager must compare every employee with every other employee within the department or work group. Each employee is compared with another, and out of the two, the higher performer is given a score of 1. Once all the pairs are compared, the scores are added. This method takes a lot of time and, again, must have specific criteria attached to it when comparing employees.
Human Resource Recall
How can you make sure the performance appraisal ties into a specific job description?
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