Evaluations often focus only on events during the current rating period and overlook past performance. As a result, past deficiencies are often never corrected. Presenting information pictorially can have much greater impact than communicating the same information only verbally. In addition, using graphs will help evaluators maintain some degree of consistency in their ratings. Several techniques are currently available for presenting information graphically. The circle chart, the bar graph, and the line graph all have applications for measuring employee performance. A circle graph could use a pie chart to illustrate an employee's attendance record. A bar graph can compare an employee's development and work progress from one evaluation period to the next. A line graph can compare an employee's work performance against the shift average. Graphs should be simple and attractive. Supervisors should explain them and encourage discussion.