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workload

 
Dictionary: work·load   (wûrk'lōd') pronunciation
 
n.
  1. The amount of work assigned to or expected from a worker in a specified time period.
  2. The amount of work that a machine produces or can produce in a specified time period.

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Measure of the amount and types of work performed by an individual within a given period of time. It is both a quantitative measure of the total work performed and a qualitative measure of the person's perception of his ability to perform the work.

 
US Supreme Court: Workload
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Since the end of World War II, the number of cases filed with the Supreme Court has grown significantly, mushrooming from 1,295 in 1947 to nearly 9,500 in 2002. Filings are the cases presented to the Court for its consideration each term. Since, however, the Court's discretionary power permits it to deny substantive review to more than 90 percent of the cases filed, the number of filings alone cannot constitute a precise indicator of the Court's workload. Other factors must also be considered, including the time allotted to each case decided on the merits; the number, length, and complexity of opinions; and the amount of work delegated to law clerks.

Nevertheless, the upward trend in case filings has generated wide concern. As former Chief Justice Warren Burger and others have observed, the increase in filings has magnified the sheer volume of cases that require some action. More petitions require more time, although there is little empirical evidence that more filings require substantially more screening time. While the justices have not taken commensurately greater numbers of cases to review on the merits, there is at least mixed evidence that the time required for the Court to render a decision on the merits has increased. But this may be due more to the increasing complexity of cases decided than to the initial number of cases filed.

Much of the concern about the Court's workload focuses not on time or level of effort but on the quality of attention devoted to individual cases. Particular concern has been expressed about the justices' seeming inability to agree on major opinions and about the clarity of their reasoning and decisions. In a 1983 article, Philip Kurland and Dennis Hutchinson charge that an overloaded docket leads to “sleazy” opinions on the merits. Whether the Court's product has in fact deteriorated cannot be assessed fully or even objectively. There is no agreed‐on basis for judgment or comparison, and, even if such standards could be developed, the causes of alleged deterioration would be difficult to identify. How much could be attributed to workload and how much to clashing ideological and attitudinal preferences of the justices?

There are also those, including a number of the justices, who simply deny that there is a workload problem of any consequence—certainly not one that requires corrective action beyond a little more concentrated effort and/or greater reliance on law clerks. No justice claims that he or she personally reads all certiorari petitions. There is also widespread agreement among the justices that in forma pauperis cases, which comprise nearly half the initial filings, are largely frivolous and can be disposed of quickly. In fact, fewer than 1 percent of these cases are granted review. Nevertheless, these petitions do require some attention and thus must be factored into any calculation of just what the Court's workload is and whether or not it constitutes a problem.

If the nature of the Court's workload is clouded by disagreement about causes, consequences, and significance, there is no paucity of proposed solutions to the alleged problem. Some of these involve statutory changes in jurisdiction, such as the Judicial Improvements and Access to Justice Act of 1988, which eliminated the mandatory appeal route of access to the Court in all but a few cases. Others have called for limiting or expediting the consideration of certain categories of cases that are particularly time consuming, such as habeas corpus in capital punishment cases. But these are also cases with high political content; proposals to limit them are at least as responsive to ideological as to workload considerations.

Still other critics have called for the creation of new courts, or the modification of the jurisdiction of existing courts, to siphon off certiorari petitions, or other cases referred by the Court itself, from its docket. But such “solutions” might add to the problem rather than solving it. They would create another tier of federal appellate courts, thus inevitably increasing problems of delay and policy confusion. And, more important to many, they would necessarily detract from, and thus reduce, the Court's policy impact. Of course, weakening the Court is (or was) high on the agenda of its conservative critics. Now that the Court has taken a distinctly rightward turn, these suggested “reforms” have become much less prominent.

The Court has itself attempted to address the workload issue. The justices rely on their law clerks to screen certiorari petitions. Seven of the nine justices now participate in a clerk cert pool established by former Justice Lewis Powell. One clerk from each justice's chambers is assigned to review petitions and distribute a “pool memo” to each participating justice's chambers—where they may be taken at face value or reviewed again by another clerk. In theory this reduces the number of clerks and the amount of individual judicial attention devoted to certiorari petitions. How much time it actually saves is, at best, debatable.

Beyond screening certiorari petitions, there has been an increased delegation to clerks of additional duties in the writing of opinions. The number of clerks assigned to each justice (though not always utilized) has increased to four. Whether increasing the clerks' workload and responsibilities also eases the workload on individual justices is unclear. Relying more heavily on clerks to draft opinions has also resulted in opinions of much greater length, with vastly more footnotes, and probably in a reduced receptivity to a genuinely collegial product.

The Court can also dispose of some cases by summary procedures that do not require the same level of intense and individualized attention as full opinion cases. It has, in the past decade, increased the number of petitions in which, without additional briefs or oral argument, it has vacated the judgment of a lower court and remanded for decision “not inconsistent with” a recently decided case. The Court has also decided more cases with only a per curiam opinion. While these opinions may contain some legal reasoning, they are usually too brief to provide lower courts or future litigants with much guidance. In either instance the charge could be made that the litigants—and the law—are receiving treatment that is below par.

Finally, the Court can adjust to its workload by lengthening the deliberative process, for example, in extending the time frame between certiorari and oral argument and again between argument and the announcement of its decision. But this simply increases the wait or queue for decision and leads to a growing backlog—something that, except for a few recent terms, the modern Court has been able to avoid. Some cases are inevitably carried over until the next term: those filed late in the term, those selected for decision late in a term, and a few that have been argued but cannot be resolved in time to announce by the term's end (or which are set over for reargument). This allows the Court to maintain its traditional deliberative practices.

When the Court's normal rhythm is disturbed, however, litigants have to wait longer to learn if the Court will decide their case and longer again for the case to be decided. While a few months extra delay, if uniform and expected, would not be severely consequential for the litigants or the society, it would certainly diminish the Court's image as perhaps the only governmental body in Washington that keeps more or less abreast of its work.

Assuming that the Supreme Court will not (and should not) alter its traditional deliberative practices for those cases that it does decide “on the merits,” it has probably instituted most of the marginal, internal changes that might expedite processing of cases. There is little support, and probably no authority, for more radical changes designed to ease its workload (such as a division of the Court into panels) or for delegating some opinion‐writing functions to a central staff. Unless and until American society redirects its increasing reliance on judicial decisions, the Court's workload is likely to continue to grow. Only when the justices themselves cry for help is some major restructuring likely to occur.

Bibliography

  • Gerhard Casper and Richard Posner, The Workload of the Supreme Court (1976).
  • Philip Kurland and Dennis Hutchinson, The Business of the Supreme Court, O.T. 1982, University of Chicago Law Review 50 (1983): 628–651.
  • Of High Designs: A Compendium of Proposals to Reduce the Workload of the Supreme Court, note in Harvard Law Review 97 (1983): 307–325

— William P. McLauchlan

 
Wikipedia: Workload
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The term workload can refer to a number of different yet related entities.

Contents

An amount of labor

While a precise definition of a workload is elusive, a commonly accepted definition is the hypothetical relationship between a group or individual human operator and task demands.

The assessment of operator workload has a vital impact on the design of new human-machine systems. By evaluating operator workload during the design of a new system, or iteration of an existing system, problems such as workload bottlenecks and overload can be identified. As the human operator is a central part of a human-machine system, the correction of these problems is necessary for the operation of safe and efficient systems.

An operating budget may include estimates of the expected workload for a specific activity. Work loads can vary in many different siatuations, but the average workload is average.

Quantified effort

Workload can also refer to the total energy output of a system, particularly of a person or animal performing a strenuous task over time. One particular application of this is weight lifting/weights training, where both anecotal evidence and scientific research has shown that it is the total "workload" that is important to muscle growth, as opposed to just the load, just the volume, or "time under tension". In these and related uses of the word, "workload" can be broken up into "work+load", referring to the work done with a given load. In terms of weights training, the "load" refers to the heaviness of the weight being lifted (20 kg is a greater load than 10 kg), and "work" refers to the volume, or total number of reps and sets done with that weight (20 reps is more work than 10 reps, but 2 sets of 10 reps is the same work as 1 set of 20 reps, its just that the human body cannot do 20reps of a heavy weight without a rest, so its best to think of 2x10 as being 20 reps, with a rest in the middle).

This theory was also used to determine horse power (hp), which was defined as the amount of work a horse could do with a given load over time. The wheel that the horse turned in Watt's original experiment put a certain load on the horse's muscles, and the horse could do a certain amount of work with this load in a minute. Provided the horse was a perfect machine, it would be capable of a constant maximum workload, so increasing the load by a given percentage would result in the possible work done decreasing by the same percentage, so that it would still equal "1 hp". However, horses are not perfect machines and over short time periods are capable of as much as 14 hp, and over long periods of exertion output an average of less than 1 hp.

The theory can also be applied to automobiles or other machines, which are slightly more "perfect" than animals, making a car heavier for instance, increases the load that the engine must pull, likewise making it more aerodynamic decreases drag, which acts as a load on the car as well. Torque can be thought of as the ability to move load, and the revs are how much work it can do with that load in a given amount of time. Therefore torque and revs together create kilowatts, or total power output, which can be related to the "workload" of the engine/car, or how much work it can do with a given amount of load. As engines are more mechanically perfect than animals' muscles, and do not fatigue in the same way, they will confirm much more closely to the formula that if you apply more load, they will do less work, and visa versa.

Workload Theory and Workload Modelling

Another aspect to workload is the mathematical predictive models used in human factors analysis; generally to support the design and assessment of safety-critical systems.

There is no one agreed definition of workload and consequently not one agreed method of assessing or modelling it. One example definition by Hart and Staveland (1988) describes workload as “the perceived relationship between the amount of mental processing capability or resources and the amount required by the task”. Workload modelling is the analytical technique used to measure and predict workload. The main objective of assessing and predicting workload is to achieve evenly distributed, manageable workload and to avoid overload or underload.

Workload theories

Wickens’ (1984) multiple resource theory (MRT) model is illustrated in figure 1:

Image:KTS1workload.jpg

Figure 1: Wickens’ Multiple Resource Theory (MRT) Model

Wickens MRT proposes that the human operator does not have one single information processing source that can be tapped, but several different pools of resources that can be tapped simultaneously. Each box in figure 1 indicates one cognitive resource. Depending on the nature of the task, these resources may have to process information sequentially if the different tasks require the same pool of resources, or can be processed in parallel if the task requires different resources.

Wickens’ theory views performance decrement as a shortage of these different resources and describes humans as having limited capability for processing information. Cognitive resources are limited and a supply and demand problem occurs when the individual performs two or more tasks that require a single resource (as indicated by one box on the diagram). Excess workload caused by a task using the same resource can cause problems and result in errors or slower task performance. For example, if the task is to dial the phone then no excess demands are being placed on any one component. However, if another task is being performed at the same time that makes demands on the same component(s), the result may be excess workload.

The relationship between workload and performance is complex. It is not always the case that as workload increases performance decreases. Performance can be affected by workload being too high or too low (Nachreiner, 1995). Sustained low workload (underload) can lead to boredom, loss of situation awareness and reduced alertness. Also as workload increases performance may not decrease as the operator may have a strategy for handling task demands.

Wickens’ theory allows system designers to predict when:

  • Tasks can be performed concurrently.
  • Tasks will interfere with each other.
  • Increases in the difficulty of one task will result in a loss of performance of another task.

McCracken and Aldrich (1984), like Wickens, describe processing not as one central resource but several processing resources: visual, cognitive, auditory, and psychomotor (VCAP). All tasks can be decomposed into these components.

  • The visual and auditory components are external stimuli that are attended to.
  • The cognitive component describes the level of information processing required.
  • The psychomotor component describes the physical actions required.

They developed rating scales for each of the VCAP components, which provide a relative rating of the degree to which each resource component is used.

Joseph Hopkins (unpublished) developed a training methodology, where the background to his training theory is that complex skills are, in essence, resource conflicts where training has removed or reduced the conflicting workload demands, either by higher level processing or by predictive time sequencing. His work is in effect based on Gallwey (1974) and Morehouse (1977). The theory postulates that the training allows the different task functions to be integrated into one new skill. An example of this is learning to drive a car. Changing gear and steering are two conflicting tasks (i.e. both require the same resources) before they are integrated into the new skill of “driving”. An experienced driver will not need to think about what to do when turning a corner (higher level processing) or alternatively may change gear earlier than required to give sufficient resources for steering round the corner (predictive time sequencing).

Creating a workload model

With any attempt at creating a workload model the process begins with understanding the tasks to be modelled. This is done by creating a task analysis that defines:

  • The sequence of tasks performed by individuals and team members.
  • The timing and workload information associated with each task.
  • Background scenario information.

Each task must be defined to a sufficient level to allow realistic physical and mental workload values to be estimated and to determine which resources (or combination of resources) are required for each task – visual, auditory, cognitive and psychomotor. A numerical value can be assigned to each based on the scales developed by McCracken and Aldrich.

These numerical values against each type of resource are then entered into the workload model. The model sums the workload ratings within each resource and across concurrent tasks. The critical points within the task are therefore identified. When proposals are made for introducing new devices onto the current baseline activities the impact of this can then be compared to the baseline. Possibly one of the most advanced workload models was developed by K Tara Smith (2007): this model integrated the theories of Wickens, McCracken and Aldrich and Hopkins to produce a model that not only predicts workload for an individual task but also indicates how that workload may change given the experience and training level of the individuals carrying out that task. Workload assessment techniques are typically used to answer the following types of questions: Eisen, P.S and Hendy, K.C. (1987):

  • Does the operator have capability to perform the required tasks?
  • Does the operator have enough spare capacity to take on additional tasks?
  • Does the operator have enough spare capacity to cope with emergency situations?
  • Can the task or equipment be altered to increase the amount of spare capacity?
  • Can the task or equipment be altered to increase/decrease the amount of mental workload?
  • How does the workload of a new system compare to the old system?

See also


 
Translations: Workload
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Dansk (Danish)
n. - arbejdsbyrde, arbejdspres, arbejdsydelse

Nederlands (Dutch)
hoeveelheid werk

Français (French)
n. - charge de travail

Deutsch (German)
n. - Arbeitslast

Ελληνική (Greek)
n. - φορτίο εργασίας

Italiano (Italian)
carico di lavoro

Português (Portuguese)
n. - carga de trabalho para uma pessoa em um período de tempo (f)

Русский (Russian)
объем подлежащих выполнению работ, рабочая норма

Español (Spanish)
n. - volumen de trabajo

Svenska (Swedish)
n. - arbetsbelastning

中文(简体)(Chinese (Simplified))
工作量

中文(繁體)(Chinese (Traditional))
n. - 工作量

한국어 (Korean)
n. - (사람, 기계의) 작업 부하, 표준 노동량

日本語 (Japanese)
n. - 作業負荷

العربيه (Arabic)
‏(الاسم) حجم العمل‏

עברית (Hebrew)
n. - ‮עומס עבודה‬


 
 

 

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Dictionary. The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2007. Published by Houghton Mifflin Company. All rights reserved.  Read more
Business Dictionary. Dictionary of Business Terms. Copyright © 2000 by Barron's Educational Series, Inc. All rights reserved.  Read more
US Supreme Court. The Oxford Companion to the Supreme Court of the United States. Copyright © 1992, 2005 by Oxford University Press. All rights reserved.  Read more
Wikipedia. This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Workload" Read more
Translations. Copyright © 2007, WizCom Technologies Ltd. All rights reserved.  Read more

 

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