5-CH22-23(ts) - CHAPTER 22 LECTURE 39-40 TIME STUDY RATING...

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CHAPTER: 22 LECTURE: 39-40 TIME STUDY: RATING
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RATING RATING is the fifth step out of the 8 steps stated for the time study procedure. RATING is the assessment of the worker’s rate of working in relation to the observer’s own concept of the rate of the effective speed of the work in performing the task. In conducting ‘time study’, work study engineer should select an ‘average qualified worker ’, and NOT a ‘qualified worker’ as defined earlier.
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CONTD. An average qualified worker would take an average amount of time in performing the job, and this average time value would be obtained from the ‘normal distribution curve’. (a frequency distribution of times taken by a group of workers in doing the job.)
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STANDARD RATING & The ‘rating’ term means a comparison of the rate of working (as observed by the time- study engineer) with a picture of some standard level of performance (which is in the mind of the engineer). This standard level is the average rate at which a qualified worker performs the job when using a pre-specified method . THIS RATE OF WORKING CORRESPONDS TO WHAT IS CALLED ‘STANDARD RATING’ ‘Standard rating’ is denoted by 100 on some rating scale.
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STANDARD PERFORMANCE Confidence in the accuracy of one’s rating can be obtained only through long experience and practice on different type of jobs. Thus how accurately one can compare the ‘observed rate of working’ with the ‘theoretical standard’ depends on the EXPERIENCE of the time-study engineer. In the ‘rating’ task, different factors may be the ‘basis of comparison’. For example, the factors may be ‘speed’ , ‘effort’ , ‘skill’ , ‘conditions of work’ etc. Operations involving ‘mental activities’ are most difficult to be rated.
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SCALES OF RATING For ‘rating’, we need a NUMERICAL SCALE against which the assessment is made. Thus a factor called RATING FACTOR may be developed and it may be used for multiplying the ‘OBSERVED TIME’ to get ‘BASIC TIME’, which is also called NORMAL TIME. There are several scales used for rating. Most commonly used scales are: 60-80 scale 75-100 scale 100-133 scale 0-100 scale
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BRITISH STANDARD SCALE The scale 0-100 is called BRITISH STANDARD SCALE and is a modified form of 75-100 scale.
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