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Measuring Overall Craft Effectiveness (OCE) - page 6 / 13





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The Maintenance Excellence Institute

How OCE Impacts Your Bottom Line: Part II – Page 6

  • Historical data: The results of past experience are captured via the CMMS or other means to get average times to do a specific task. Overtime, a database of estimated time is developed which can be updated with a running average time computed for the tasks.

  • Predetermined standard data: Standard data tables for a wide range of small maintenance tasks have been developed. Standard data represents the building blocks that can then be used to estimate larger, more complex jobs. Each standard data table provides what the operation is, what is included in the time value and the table of standard data time for the variables that are included. The Universal Maintenance Standards (UMS) method used back in the 1970’s represents a predetermined standard data method.

The ACE Team Benchmarking Process: As a means to overcome many of the inherent difficulties associated with developing maintenance performance standards, the ACE (A Consensus of Experts) Team Benchmarking Process. This process was developed back in 1978 by Ralph W. “Pete” Peters, founder of The Maintenance Excellence Institute (MEI). This method, based upon principles of the Delphi Technique, relies primarily on the combined experience and estimating ability of a group of skilled crafts personnel. The objective is to determine reliable planning times for a number of selected “benchmark” jobs. This team based process using skilled craft people places a high emphasis on continuous maintenance improvement to reflect improvements in performance and methods as they occur.

Generally, the ACE Team Benchmarking Process parallels the UMS (Universal Maintenance Standards) approach in that the “range of time concept” and “slotting” is used once the work content times for a representative number of “benchmark jobs” have been established. The ACE Team Benchmarking Process focuses primarily on the development of work content times for representative “benchmark jobs” that are typical of the craft work performed by the group (Peters 1978).

Once a number of benchmark job times have been established, these jobs are then categorized onto spreadsheets by craft and task area and according to work groups which represent various ranges of times. Spreadsheets are then set up with 4 work groups/sheet with each work group having a time slots or “range of time”. For example, work group E would be for benchmark jobs ranging from 0.9 hours up to 1.5 hours and assigned a standard time (slot time) of 1.2 hours. Like wise, work group F would be for benchmark jobs ranging from 1.5 hours up to 2.5 hours and assigned a standard time of 2.0 hours. Spreadsheets include brief descriptions of the benchmark jobs and represent pure wrench time. Work content comparison is then done by an experience person, typically a trained planner to establish planning times within the 95% confidence range. A complete users guide complete with step by step procedure, forms and the recommended ACE Team charter for establishing the ACE Team Benchmarking Process is available free by contacting The Maintenance Excellence Institute at www.Pride-in-Maintenance.com or via E-mail: info@Pride-in-Maintenance.com.

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