Accuracy of Assignments
Assigning costs accurately to cost objects is crucial. Accuracy is not evaluated based on knowledge of some underlying “true” cost. Rather, it is a relative concept and has to do with the reasonableness and logic of the cost assignment methods used. The objective is to measure and assign, as well as possible, the cost of the resources consumed by a cost object. The intuitive and somewhat tongue-in-cheek guideline is expressed as follows: “It is better to be approximately correct than precisely inaccurate.” Some cost assignment methods are clearly more accurate than others.
example, suppose you want to determine the cost of lunch for Ryan Chesser, a student who frequents Hideaway, an off-campus pizza parlor. One cost assignment approach is to count the number of customers Hideaway has between 12:00 p.m. and 1:00 p.m. and then divide the total receipts earned during this period by this number of customers. Suppose that this comes out to $5.175 per lunchtime customer (note the three-decimal precision). Thus, based on this approach, we would conclude that Ryan spends $5.175 per day for lunch. Another approach is to go with Ryan and observe how much he spends. Suppose that he has a small pizza, salad, and a medium drink each day, costing $6.50. It is not difficult to see which cost assignment is more accurate. The $5.175 cost assignment is distorted (in spite of its three-decimal precision) by the consumption patterns of other customers (cost objects). As it turns out, most lunchtime clients order the luncheon special for $4.99 (a minipizza, salad, and medium drink).
Distorted cost assignments can produce erroneous decisions and bad evaluations. For example, if a plant manager is trying to decide whether to continue producing power internally or to buy it from a local utility company, then an accurate assessment of how much it is costing to produce the power is fundamental to the analysis. An overstatement of the cost of power production could suggest to the manager that the internal power department should be shut down in favor of external purchase, whereas a more accurate cost assignment might reveal the opposite. It is easy to see that bad cost assignments can prove to be costly. As the pizza example suggests, establishing a cause-and-effect relationship between the cost to be assigned and the cost object is the key to creating a reasonably accurate cost assignment
Traceability The relationship of costs to cost objects should be exploited to increase the accuracy of cost assignments. Costs are directly or indirectly associated with cost objects. Indirect costs are costs that cannot be easily and accurately traced to a cost object. Direct costs are those costs that can be easily and accurately traced to a cost object.3 “Easily traced” means that the costs can be assigned in an economically feasible way, while “accurately traced” means that the costs are assigned using a causeand- effect relationship. Thus, traceability is simply the ability to assign a cost to a cost object in an economically feasible way by means of a cause-and-effect relationship. The more costs that can be traced to the object, the greater the accuracy of the cost assignments. Establishing traceability is fundamental in building accurate cost assignments.
Assigning costs accurately to cost objects is crucial. Accuracy is not evaluated based on knowledge of some underlying “true” cost. Rather, it is a relative concept and has to do with the reasonableness and logic of the cost assignment methods used. The objective is to measure and assign, as well as possible, the cost of the resources consumed by a cost object. The intuitive and somewhat tongue-in-cheek guideline is expressed as follows: “It is better to be approximately correct than precisely inaccurate.” Some cost assignment methods are clearly more accurate than others.
example, suppose you want to determine the cost of lunch for Ryan Chesser, a student who frequents Hideaway, an off-campus pizza parlor. One cost assignment approach is to count the number of customers Hideaway has between 12:00 p.m. and 1:00 p.m. and then divide the total receipts earned during this period by this number of customers. Suppose that this comes out to $5.175 per lunchtime customer (note the three-decimal precision). Thus, based on this approach, we would conclude that Ryan spends $5.175 per day for lunch. Another approach is to go with Ryan and observe how much he spends. Suppose that he has a small pizza, salad, and a medium drink each day, costing $6.50. It is not difficult to see which cost assignment is more accurate. The $5.175 cost assignment is distorted (in spite of its three-decimal precision) by the consumption patterns of other customers (cost objects). As it turns out, most lunchtime clients order the luncheon special for $4.99 (a minipizza, salad, and medium drink).
Distorted cost assignments can produce erroneous decisions and bad evaluations. For example, if a plant manager is trying to decide whether to continue producing power internally or to buy it from a local utility company, then an accurate assessment of how much it is costing to produce the power is fundamental to the analysis. An overstatement of the cost of power production could suggest to the manager that the internal power department should be shut down in favor of external purchase, whereas a more accurate cost assignment might reveal the opposite. It is easy to see that bad cost assignments can prove to be costly. As the pizza example suggests, establishing a cause-and-effect relationship between the cost to be assigned and the cost object is the key to creating a reasonably accurate cost assignment
Traceability The relationship of costs to cost objects should be exploited to increase the accuracy of cost assignments. Costs are directly or indirectly associated with cost objects. Indirect costs are costs that cannot be easily and accurately traced to a cost object. Direct costs are those costs that can be easily and accurately traced to a cost object.3 “Easily traced” means that the costs can be assigned in an economically feasible way, while “accurately traced” means that the costs are assigned using a causeand- effect relationship. Thus, traceability is simply the ability to assign a cost to a cost object in an economically feasible way by means of a cause-and-effect relationship. The more costs that can be traced to the object, the greater the accuracy of the cost assignments. Establishing traceability is fundamental in building accurate cost assignments.
It is possible for a particular cost item to be classified as both a direct cost and an indirect cost. Management accounting systems typically deal with many cost objects. It all depends on which cost object is the point of reference. For example, if a hospital is the cost object, then the cost of heating and cooling the hospital is a direct cost. However, if the cost object is a surgical procedure performed in the hospital, then this utility cost is an indirect cost.
Methods of Tracing Traceability means that costs can be assigned easily and accurately, whereas tracing is the actual assignment of costs to a cost object using an observable measure of the resources consumed by the cost object. Tracing costs to cost objects can occur in one of two ways: (1) direct tracing or (2) driver tracing. Direct tracing is the process of identifying and assigning costs that are exclusively and physically associated with a cost object. This is most often accomplished by physical observation. Consider the pizza example. The cost object is Ryan Chesser’s lunch. By observing that he has a small pizza, salad, and medium drink, we can assign the cost of $6.50. The cost is directly traceable to him. As a second example, let the cost object be a product: bicycles. The product uses both materials and labor. It is easy to observe how many wheels, other parts, and hours of labor are required to produce each bicycle. Both material and labor usages are physically observable, and therefore, their costs can be directly charged to a bicycle. In both examples, the cost objects are the exclusive consumers of the resources in question. Ideally, all costs should be charged to cost objects using direct tracing. Unfortunately, it is often th case that cost objects are not the exclusive consumers of resources. In this case, we appeal to driver tracing to assign costs.
Driver tracing is the use of drivers to assign costs to cost objects. In a cost assignment context, drivers are observable causal factors that measure a cost object’s resource consumption. They are factors that cause changes in resource usage and thus have a cause-and-effect relationship with the costs associated with a cost object. For example, assume that Ryan Chesser and Shana Parker go to lunch together. Shana and Ryan agree to share the cost of the lunch. They order a medium pizza (divided into 10 slices) for $9, a pitcher of root beer for $2 (five glasses of content), and Shana orders a small salad for $1. How much cost should be assigned to each person? Note that the two share the pizza and root beer, whereas the salad is a “resource” exclusive to Shana. The cost of the salad, then, is assigned by direct tracing ($1 to Shana and $0 to Ryan). To assign the costs of the pizza and root beer,
drivers are chosen: slices of pizza and glasses of root beer, respectively. A rate is calculated per unit of resource (as measured by the drivers): $0.90 per slice of pizza ($9/10) and $0.40 per glass of root beer ($2/5). Next, usage of the driver is observed for each person (cost object). Assume that Ryan eats seven slices of pizza and drinks three glasses of root beer, with Shana consuming the remainder. Thus, the cost per person is calculated as follows:
Methods of Tracing Traceability means that costs can be assigned easily and accurately, whereas tracing is the actual assignment of costs to a cost object using an observable measure of the resources consumed by the cost object. Tracing costs to cost objects can occur in one of two ways: (1) direct tracing or (2) driver tracing. Direct tracing is the process of identifying and assigning costs that are exclusively and physically associated with a cost object. This is most often accomplished by physical observation. Consider the pizza example. The cost object is Ryan Chesser’s lunch. By observing that he has a small pizza, salad, and medium drink, we can assign the cost of $6.50. The cost is directly traceable to him. As a second example, let the cost object be a product: bicycles. The product uses both materials and labor. It is easy to observe how many wheels, other parts, and hours of labor are required to produce each bicycle. Both material and labor usages are physically observable, and therefore, their costs can be directly charged to a bicycle. In both examples, the cost objects are the exclusive consumers of the resources in question. Ideally, all costs should be charged to cost objects using direct tracing. Unfortunately, it is often th case that cost objects are not the exclusive consumers of resources. In this case, we appeal to driver tracing to assign costs.
Driver tracing is the use of drivers to assign costs to cost objects. In a cost assignment context, drivers are observable causal factors that measure a cost object’s resource consumption. They are factors that cause changes in resource usage and thus have a cause-and-effect relationship with the costs associated with a cost object. For example, assume that Ryan Chesser and Shana Parker go to lunch together. Shana and Ryan agree to share the cost of the lunch. They order a medium pizza (divided into 10 slices) for $9, a pitcher of root beer for $2 (five glasses of content), and Shana orders a small salad for $1. How much cost should be assigned to each person? Note that the two share the pizza and root beer, whereas the salad is a “resource” exclusive to Shana. The cost of the salad, then, is assigned by direct tracing ($1 to Shana and $0 to Ryan). To assign the costs of the pizza and root beer,
drivers are chosen: slices of pizza and glasses of root beer, respectively. A rate is calculated per unit of resource (as measured by the drivers): $0.90 per slice of pizza ($9/10) and $0.40 per glass of root beer ($2/5). Next, usage of the driver is observed for each person (cost object). Assume that Ryan eats seven slices of pizza and drinks three glasses of root beer, with Shana consuming the remainder. Thus, the cost per person is calculated as follows:
This simple pizza example of a shared resource extends into more complex business settings. Inspecting products may be the “pizza” shared by precision surgical instruments produced in a plant. The cost of inspection can be assigned to individual instruments (the cost objects) using number of inspection hours (“slices of pizza”) consumed by each type of instrument. Consider, as a second example, the cost of a heart monitor used by cardiac patients (the cost object). The heart monitor is the “pizza,” and monitoring hours used could be the “slices of pizza” chosen to assign the costs to cardiac patients. Thus, the tracing principles described by the pizza example relate directly to costing within realistic business environments
Assigning Indirect Costs Indirect costs are those costs that cannot be assigned to cost objects using either direct or driver tracing. That is, no causal relationship exists between the cost and the cost object or that tracing is not economically feasible. Assignment of indirect costs to cost objects is called allocation. Since no causal relationship exists, allocating indirect costs is based on convenience or some assumed linkage. For example, suppose that Blue Ribbon Baking Company installed the mini coffee cake line in its existing factory building. Consider the cost of heating and lighting this plant in which the two different product lines are manufactured.
Suppose that this utility cost is to be assigned to the two product lines. Clearly, it is difficult to see any causal relationship. A convenient way to allocate this cost is simply to assign it in proportion to the direct labor hours used by each product. Arbitrarily assigning indirect costs to cost objects reduces the overall accuracy of the cost assignments. Accordingly, the best costing policy may be assigning only direct (traceable) costs to cost objects. However, allocations of indirect costs may serve other purposes besides accuracy. For example, allocating indirect costs to products (a cost object) may be required to satisfy external reporting conventions. Nonetheless, most managerial uses of cost assignments are better served by accuracy; thus, at the very least, tracing and allocation cost assignments should be reported separately.
Cost Assignment Summarized The foregoing discussion reveals three methods of assigning costs to cost objects: direct tracing, driver tracing, and allocation Identifyingdrivers and assessing the quality of the causal relationship is much more costly than either direct tracing or allocation. In fact, one advantage of allocation is its simplicity and low cost of implementation. However, allocation is the least accurate cost assignment method, and its use should be avoided where possible. In many cases, the benefits of increased accuracy outweigh the additional measurement cost associated with driver tracing. This cost-benefit issue is discussed more fully later in the chapter. What it really entails is choosing among competing management accounting information systems.
Assigning Indirect Costs Indirect costs are those costs that cannot be assigned to cost objects using either direct or driver tracing. That is, no causal relationship exists between the cost and the cost object or that tracing is not economically feasible. Assignment of indirect costs to cost objects is called allocation. Since no causal relationship exists, allocating indirect costs is based on convenience or some assumed linkage. For example, suppose that Blue Ribbon Baking Company installed the mini coffee cake line in its existing factory building. Consider the cost of heating and lighting this plant in which the two different product lines are manufactured.
Suppose that this utility cost is to be assigned to the two product lines. Clearly, it is difficult to see any causal relationship. A convenient way to allocate this cost is simply to assign it in proportion to the direct labor hours used by each product. Arbitrarily assigning indirect costs to cost objects reduces the overall accuracy of the cost assignments. Accordingly, the best costing policy may be assigning only direct (traceable) costs to cost objects. However, allocations of indirect costs may serve other purposes besides accuracy. For example, allocating indirect costs to products (a cost object) may be required to satisfy external reporting conventions. Nonetheless, most managerial uses of cost assignments are better served by accuracy; thus, at the very least, tracing and allocation cost assignments should be reported separately.
Cost Assignment Summarized The foregoing discussion reveals three methods of assigning costs to cost objects: direct tracing, driver tracing, and allocation Identifyingdrivers and assessing the quality of the causal relationship is much more costly than either direct tracing or allocation. In fact, one advantage of allocation is its simplicity and low cost of implementation. However, allocation is the least accurate cost assignment method, and its use should be avoided where possible. In many cases, the benefits of increased accuracy outweigh the additional measurement cost associated with driver tracing. This cost-benefit issue is discussed more fully later in the chapter. What it really entails is choosing among competing management accounting information systems.
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