# Ch16-Work Sampling.pptx - IE 307: Work Systems Analysis &...

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IE 307: Work Systems Analysis &DesignWork Sampling1
Work SamplingStatistical technique for determining theproportions of time spent by subjects in variousdefined categories of activitySubjects = workers, machinesCategories of activity = setting up a machine,producing parts, idle, etc.For statistical accuracyObservations must be taken at randomtimesPeriod of the study must be representativeof the types of activities performed by thesubjects2
When to use Work Sampling?Sufficient time is available to perform the studySeveral weeks usually required for a worksampling studyMultiple subjectsWork sampling suited to studies involvingmore than one subjectLong cycle times for the jobs covered by thestudyNonrepetitive work cyclesJobs consist of various tasks rather than asingle repetitive task3
Example: How Work Sampling WorksA total of 500 observations taken at randomtimes during a one-week period (40 hours) on10 machines with results shown below.CategoryNo. of observations(1) Being set up75(2) Running production300(3) Machine idle125500How many hours per week did an averagemachine sped in each category?4
Solution5Proportions of time determined as number ofobservations in each category divided by 500Time in each category determined by multiplyingproportion by total hours (40 hr)CategoryProportionHrs per category(1) Being set up75/500 = 0.150.15 x 40 =6(2) Running production 300/500 = 0.600.60 x 40 = 24(3) Machine idle125/500 = 0.250.25 x 40 = 101.0040
Work Sampling Applications6Machine utilization - how much time is spent bymachines in various categories of activityPrevious exampleWorker utilization - how workers spend their timeAllowances for time standards - assessment ofdelay components in PFD allowance factorAverage unit time - determining the average timeon each work unitTime standards - limited statistical accuracywhen standards set by work sampling
Statistical Basis of Work Sampling7Binomial distribution, in which parameterp=true proportion of time spent in a givencategory of activityThere are usually multiple activity categories,so we havep1,p2, . . ,pk, . .,pK

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Interval finite element, work systems analysis