IE271_Lecture14 - IE271OperationsAnalysis andDesign Direct...

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    IE271 – Operations Analysis  and Design Direct Time Study Lecture Notes – 14
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Time Study - Objective Determine the time that a person suited to the job and well-trained in the specified method needs to do the job at a normal or standard rate.
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Time Is Important Most workers are paid for their time on the job The labor content (cost of labor time) is often a major factor in the total cost of a product or service For any organization, it is important to know how much time will be required to accomplish a given amount of work
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Some Definitions   Work measurement – evaluation of a task in terms of the time that should be allowed by an average worker to perform the task Standard time – amount of time that should be allowed for an average worker to process one work unit using the standard method and working at normal pace Time study – all the ways in which time is analyzed in work situations
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When Are Time Standards  Beneficial? Characteristics of industrial situations in which time standards would be beneficial Low productivity Repeat orders Long production runs Repetitive work cycles Short cycle times
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Functions of Time Standards   They define a “fair day’s work” They provide a means to convert workload into staffing and equipment needs They allow alternative methods to be compared objectively
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Functions of Time Standards   They provide a basis for wage incentives and evaluation of worker performance They provide time data for: Production planning and scheduling Assembly line balancing Cost estimating Material requirements planning
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Methods to Determine Time  Standards 
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Work Measurement Techniques Direct time study (DTS) Predetermined motion time system (PMTS) Performance rating is not required Can be applied to determine the time standard for a task before production Standard data systems (SDS) Work sampling
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Measurement
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Computerized Work Measurement Facilitates collection of data Performs routine computations Organizes time standards files and databases Retrieves data in predetermined motion time systems and standard data systems Assists in the preparation of the documentation Methods descriptions, Reports
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Prerequisites for Valid Time  Standards Factors that must be standardized before a time standard can be set
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Average Worker Must be qualified and well trained Experience – time on the job Learning period depends on the person and the job Rule of thumb – give the operator at least two weeks before performing time study
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Specified method Work instructions Material specifications Tools and equipment to be used Positions of the incoming and outgoing material Safety, quality, maintenance and housekeeping requirements
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Standard Performance Standard performance is commonly defined
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IE271_Lecture14 - IE271OperationsAnalysis andDesign Direct...

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