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"As part of the production-planning process, firms must ensure that the resources needed for production—such as raw materials, parts, equipment, and labor—will be available at strategic moments in the production process. This can be a huge challenge. The components used to build just one Boeing airplane, for instance, number in the millions. Cost is also an important factor. In many industries, the cost of materials and supplies used in the production process amounts to as much as half of sales revenues. Resource planning is therefore a big part of any firm’s production strategy. Resource planning begins by specifying which raw materials, parts, and components will be required, and when, to produce finished goods. To determine the amount of each item needed, the expected quantity of finished goods must be forecast. A bill of material is then drawn up that lists the items and the number of each required to make the product. Purchasing , or procurement, is the process of buying production inputs from various sources. Make or Buy? The firm must decide whether to make its own production materials or buy them from outside sources. This is the make-or-buy decision . The quantity of items needed is one consideration. If a part is used in only one of many products, buying the part may be more cost-effective than making it. Buying standard items, such as screws, bolts, rivets, and nails, is usually cheaper and easier than producing them internally. Purchasing larger components from another manufacturer can be cost-effective as well. When items are purchased from an outside source instead of being made internally, it is called outsourcing . Harley-Davidson, for example, purchases its tires, brake systems, and other motorcycle components from manufacturers that make them to Harley’s specifications. However, if a product has special design features that need to be kept secret to protect a competitive advantage, a firm may decide to produce all parts internally. In deciding whether to make or buy, a firm must also consider whether outside sources can provide the high- quality supplies it needs in a reliable manner. Having to shut down production because vital parts aren’t delivered on time can be a costly disaster. Just as bad are inferior parts or materials, which can damage a firm’s reputation for producing high-quality goods. Therefore, firms that buy some or all of their production materials from outside sources should make building strong relationships with quality suppliers a priority."