An error-tolerant design is one that does not unduly penalize user errors. It is the human equivalent of
fault tolerantdesign that allows equipment to continue functioning in the presence of hardware faults, such as a "limp-in" mode for an automobileelectronics unit that would be employed if something like the oxygen sensorfailed.
Use of behavior shaping constraints to prevent errors
Use of forcing functions or
behavior-shaping constraints is one technique in error-tolerant design. An example is the interlock or lockout of reverse in the transmission of a moving car. This prevents errors, and prevention of errors is the most effective technique in error-tolerant design. The practice is known as poka-yokein Japan where it was introduced by Shigeo Shingoas part of the Toyota Production System.
Mitigation of the effects of errors after they are made
The next most effective technique in error-tolerant design is the mitigation or limitation of the effects of errors after they have been made. An example is a checking or confirmation function such as an "Are you sure"
dialog boxin computer softwarefor an action that could have severe consequences if made in error, such as deleting a file (although the consequence of inadvertent file deletion has been reduced from the DOSdays by the concept of the recycle bin in Microsoft Windowsor the trash canin Mac OSthat has been introduced in most GUIinterfaces). Adding too great a mitigating factor in some circumstances can become a hindrance, where the confirmation becomes mechanical this may become detrimental - for example, if a prompt is asked for every file in a batch delete, one may be tempted to simply agree to each prompt, even if a file is deleted accidentally.
Another example is
Levenshtein distanceand metaphonecalculations.
* [http://www.soartech.com/pubs/IITSEC2002-ModelingHumanError-SW.pdf Paper on error-tolerant design (pdf)]
* [http://www.sics.se/~joe/thesis/armstrong_thesis_2003.pdf Making reliable distributed systems in the presence of hardware errors (pdf)]
Wikimedia Foundation. 2010.
Look at other dictionaries:
Design — For the 1970s music group, see Design (UK band). All Saints Chapel in the Cathedral Basilica of St. Louis by Louis Comfort Tiffany. The building structure and decorations are both examples of design … Wikipedia
Design management — is the business side of design. Design managers need to speak the language of the business and the language of design … Wikipedia
Error — The word error has different meanings and usages relative to how it is conceptually applied. The concrete meaning of the Latin word error means wandering or straying . To the contrary of an illusion, an error or a mistake can sometimes be… … Wikipedia
Topic outline of design — For a more comprehensive list, see the List of design topics. Design, usually considered in the context of the applied arts, engineering, architecture, and other such creative endeavours, is used as both a noun and a verb. Design as a verb refers … Wikipedia
Outline of design — The following outline is provided as an overview of and topical guide to design: Design – as a noun informally refers to a plan or convention for the construction of an object or a system (as in architectural blueprints, engineering drawing,… … Wikipedia
Fault-tolerant system — This article contains specific implementations of fault tolerant systems. For general theory, see fault tolerant design. Fault tolerance or graceful degradation is the property that enables a system (often computer based) to continue operating… … Wikipedia
Fault-tolerant computer systems — are systems designed around the concepts of fault tolerance. In essence, they have to be able to keep working to a level of satisfaction in the presence of faults. Types of fault tolerance Most fault tolerant computer systems are designed to be… … Wikipedia
Soft error — In electronics and computing, an error is a signal or datum which is wrong. Errors may be caused by a defect, usually understood either to be a mistake in design or construction, or a broken component. A soft error is also a signal or datum which … Wikipedia
Architecture — For other uses, see Architecture (disambiguation). Brunelleschi, in the building of the dome of Florence Cathedral, not only transformed the cathedral and the city of Florence, but also the role and status of the architect … Wikipedia
Human reliability — is related to the field of human factors engineering, and refers to the reliability of humans in fields such as manufacturing, transportation, the military, or medicine. Human performance can be affected by many factors such as age, circadian… … Wikipedia