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-----------------------------Advantages and Disadvantage of the rating scalesAdvantages of the rating scales• Graphic rating scales are less time consuming to develop.• They also allow for quantitative comparison.Disadvantages of the rating scales• Different supervisors will use the same graphic scales in slightly different ways.• One way to get around the ambiguity inherent in graphic rating scales is to use behavior based scales, in which specific work related behaviors are assessed.• More validity comparing workers ratings from a single supervisor than comparing two workers who were rated by different supervisors.-----------------------------8.Comparative Evaluation MethodTwo ways are used to make a comparative evaluation, namely, the simple ranking method and the paired comparison method. In the simple or straight ranking method the employee is rated bythe evaluator on a scale of best to worst. However, the evaluator may be biased and may not judge the overall performance effectively in the absence of fixed criteria. This kind of evaluation may be more opinion-based than fact-based.Under the paired comparison method, the overall performance of one individual is directly compared with that of the other on the basis of a common criterion. This comparison is all evasive and not job-specific. While some employees emerge as clear front runners, there are others who seem to be lagging behind. This is not a popular evaluation system as employers do Job Performance Evaluation FormPage 15
not want to encourage discrimination. This is useful in companies which have a limited number of promotions or funds.-----------------------------Steps to conduct paired comparison analysis• List the options you will compare (elements as A, B, C, D, E for example).• Create a table 6 rows and 7 column.• Write down option to column and row; A to row second, cell first from left and A to row first, cell second from left; B to row third, cell first from left and B to row first, cell third from left etc;column seventh is total point.• Identify importance from 0 (no difference) to 3 (major difference).• Compare element “A” to B, C, D, E and place “point” at each cell.• Finally, consolidate the results by adding up the total of all the values for each of the options. You may want to convert these values into a percentage of the total score.-----------------------------9.Forced Choice MethodIn this method, the appraiser is asked to choose from two pairing statements which may appear equally positive and negative. However, the statements dictate the performance of the employee. An excellent example of this can be "works harder" and "works smarter". The appraiser selects a statement without having knowledge of the favorable or the unfavorable one. This method worksin companies where the appraiser shows a tendency to under-evaluate or over-evaluate the employees. Also, it is very costly to implement and does not serve the purpose of developing the employees. It can also frustrate the appraiser as he does not know which is the right option.
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