ANALYTICAL ESTIMATING OF WORK MEASUREMENT
The technique of work measurement is used to determine the time values for jobs, having long and non-repetitive operations. The time values are determined by using synthetic data or on the basis of the past experience of the work study engineer, when no synthetic or standard data is available. It is essential, that the estimator must have adequate experience of estimating, motion study, time study and the use of standard data(or synthesized time standards)
Procedure of Analytical Estimating
The various steps involved are :
1. Find out the job details such as job dimension, standard procedure to do the job, and the job conditions, such as poor illuminated, high temperature, hazardous environments, availability of jigs, fixture or tools, etc.
2. Break the job into its elements.
3. Select time values from the standard data catalogue for as many elements as possible.(i.e. use synthetic data wherever available)
4. Estimate the time values for the remaining elements(for which synthetic data is not available) from past knowledge and experience.
5. Add the time values obtained by steps 3 and 4 to get the total â€˜Basicâ€™ or â€˜Normalâ€™ time(for 100% rating)
6. Add the appropriate blanket relaxation allowance (say 10% to 20% of total normal or basic time)Note that in analytical estimating, the relaxation allowance is not added to time values of individual elements. The blanket relaxation allowances depends on the type of the job and the job conditions.
7. Add any other allowances if applicable, to arrive at the standard time for the given job.
Advantages of Analytical Estimating Technique
(i) Offers the same advantages enjoyed by synthesis method.
(ii) Helps in planning and scheduling the production
(iii) Provides a basis for fixing the labor rate for non-repetitive jobs.
(iv) Steps to improve labor control.
Since analytical estimating technique relies upon the judgment of the estimator, the time values obtained may not be as accurate and reliable as that estimated by the stop-watch time study.
Applications of Analytical Estimating Technique
(i) For non-repetitive jobs, jobs having long cycle times and jobs having elements of variable nature. For such jobs the stop-watch time study proves to be uneconomical.
(ii) For repair and maintenance work, job production, one time large projects, office routines, tool room jobs and engineering construction works.