Method for selecting a container model for component parts

A method for selecting a part-container comprising the steps of:

• setting a prototype container unit price (u), a per-unit container recovery expense (r), an annual purchase frequency (n), a durable period (y) and an annual demand quantity (D) for each of various container models other than a disposable container model for a specific component part;
• in case that said container has a durable period shorter than one year,
• calculating the annual container purchase expense (C) on the basis of said annual demand quantity (D), said annual purchase frequency (n) and said prototype container unit price (u);
• calculating an annual container recovery expense (R) on the basis of said annual demand quantity, said container recovery expense and said annual purchase frequency thereof;
• and
• calculating a total expense (Z) of said container having a durable period shorter than one year in predetermined years on the basis of said annual container purchase expense (C) and said annual container recovery expense (R) thereof;
• in case that said container has a durable period not shorter than one year,
• calculating an initial-year container purchase expense (C1) on the basis of said annual demand quantity (D) and said prototype container unit price (u) thereof;
• calculating a next-year container purchase expense (C2) on the basis of said annual demand quantity (D), said prototype container unit price (u) and an annual supplementary rate thereof;
• calculating the annual container recovery expense (R) on the basis of said annual demand quantity and said container recovery expense;
• and
• calculating a total expense (Z) in said predetermined years of said container having a durable period not shorter than one year on the basis of said initial-year container purchase expense (C1), said next-year container purchase expense (C2) and said annual container recovery expense (R);
• repeating calculation of total expenses of the others of said container models;
• and
• selecting optimum one of said container models having the least total expenses in said predetermined years among calculated said total expenses in said predetermined years and the total expense in said predetermined years of said disposable container.