Supply plan drafting device, method of drafting supply plan, program for drafting supply plan, and method of drafting production plan

A computer-implemented supply plan drafting method of drafting a supply plan of an article or a service in a plurality of supply stations capable of supplying the article or the service, comprising the steps of:

• (a) distributing a required supply volume of the article or the service to station supply volumes to be supplied from the supply stations while successively changing a distribution parameter;
• (b) calculating a station supply man-hour required to supply the article or the service of the distributed station supply volumes based on unit supply man-hour data on work force and time required to supply the article or the service per unit and setting a work-force-type-based work force for the calculated station supply man-hour while successively changing a work force parameter;
• (c) calculating a gross cost to supply the station supply volumes to be supplied from the supply stations based on the set work-force-type-based work force and unit work-force-type-based cost data on work-force-type-based cost per unit;
• and
• (d) selecting a revised distribution parameter and a revised work force parameter corresponding to a minimum of the gross cost calculated in response to changes in the distribution parameter and the work force parameter and setting as a supply plan station supply volumes that are distributed using the revised distribution parameter and the revised work-force-type-based work forces for the supply stations.

A computer-implemented production plan drafting method of drafting a production plan for producing an article in a plurality of production lines every plan-executing period including a plurality of operating days, comprising:

• a production-line-based planned production volume provisionally determining step of allocating a planned production volume during the plan-executing period to the production lines;
• an operating-time setting step of calculating an operating time in each of the production lines during the plan-executing period corresponding to a provisionally determined tact time in each of the production lines and the production-line-based planned production volume, based on a relation among tact time, planned production volume and operating time in each of the production lines;
• a number-of-workers calculating step of calculating the number of workers required in each of the production lines based on the set operating time;
• a production-line-based personnel cost calculating step of calculating a personnel cost in each of the production lines after distribution of the calculated number of workers to worker categories with different hourly wages;
• and
• a gross personnel cost calculating step of calculating a gross personnel cost in all the production lines by summing personnel costs in the respective production lines, wherein
• a minimum gross personnel cost is calculated while adjusting the number of workers distributed to the worker categories, the tact time, and the planned production volume allocated to each of the production lines.