multiple activity charts, so that, as far as possible, each member has tasks taking an equal time. To compare the efficiency of alternative methods. Other conditions being equal, the method which takes the least time will be the best method. To determine, in association with man and machine multiple activity charts, the number of machines a worker can run. Balayla model – work measurement in the service sector The work measurement concept has evolved from the manufacturing world but has not been fully adopted yet to the global shift to the service sector. Certain factors create inherent difficulties in determining standard times for labor allocation in service jobs: (a) wide variation in Time Between Arrivals and Service Performance Time; (b) the difficulty of assessing the damage done to the organization by long customer Waiting Times for service. This difficulty makes it hard to calculate the Break-Even Point between raising worker output, which minimizes labor costs but increases customer Waiting Times and reduces service quality. Dr. Isaac Balayla & Professor Yissachar Gilad from the Technion, Israel, developed the Balayla (Balaila) Model which overcomes most of the above-mentioned difficulties, by taking a multi-domain approach: 1) The model deploys a series of indicators for a correlation between output and Waiting Times. The indicator values are affected by service level of urgency. 2) the model determines the best Break-Even point by comparing the operational cost of an additional worker with the economical benefit caused by the decrease in WT. Thus, the model finds the best balance between worker output and service quality. References Balayla I.(2012) A manpower allocation model for service jobs (Balayla Model), IJSMET International Journal of Service Science, Management, Engineering, and Technology, 3(2), April–June 2012, pp 13–34. Industrial engineering