All articles starting with Q
2,252 articles
Qualitative reasoning
Qualitative reasoning is a family of artificial intelligence methods that predicts the behavior of physical systems using signs and ordinal values instead of precise numbers.
Qualitative research
Qualitative research is a method of inquiry that analyzes open-ended data, such as interviews and documents, to understand reasons, opinions, and motivations rather than measure frequencies with numbers.
Quality (business)
Quality in business, also known as conformance quality, is the degree to which a product, service, or process fulfills requirements, as defined by the ISO 9000 standards.
Quality (philosophy)
Quality (philosophy): a property or characteristic of a thing, one of Aristotle's ten categories, and the basis of the early modern primary/secondary quality distinction of Galileo, Descartes, Boyle, and Locke.
Quality assurance
Quality assurance (QA) is the part of quality management that provides confidence quality requirements will be fulfilled, internal or external, through audits, inspection, and standards such as ISO 9001.
Quality by design
Quality by design (QbD) is an approach to product and process development in which quality is built in from the outset rather than tested in afterwards.
Quality circle
A quality circle, also called a quality control circle, is a small voluntary group of employees who meet weekly to solve work problems, begun in Japan in 1962.
Quality control
Quality control (QC), also known as total quality control, is the set of operational techniques, such as inspection, testing, and statistical monitoring, used to fulfill quality requirements.
Quality Control Music
Quality Control Music: Atlanta hip-hop label and management company founded March 2013 by Kevin "Coach K" Lee and Pierre "P" Thomas; home of Migos, Lil Baby, City Girls; acquired by HYBE America in 2023 for about $300 million.
Quality cost
Quality cost, also called cost of quality (COQ), is a methodology measuring resources spent on preventing poor quality, appraising quality, and handling internal and external failures.
Quality filtering of web corpora
Quality filtering of web corpora is a set of methods developed since 2019 to score documents from web-scale collections, using three families such as heuristic rules or learned classifiers.
Quality function deployment
Quality function deployment, also known as customer-driven engineering, is a structured method translating customer needs into technical requirements, developed in Japan in the late 1960s.
Quality Improvement
Quality improvement (QI): systematic, continuous approach to improving healthcare quality and patient outcomes using methods such as PDSA cycles, Lean, and Six Sigma adapted from industry; distinct from but complementary to implementation science.
Quality management
Quality management is the coordinated set of organizational activities used to plan, control, assure, and improve product quality, combining statistical process control, continual improvement, and standards like ISO 9001.
Quality management system
A quality management system (QMS) is the documented processes, procedures, and responsibilities an organization uses to plan, control, and continually improve quality, most commonly certified to ISO 9001.
Quality of earnings
Quality of earnings is the assessment of how well a reported profit figure represents the sustainable, cash-generating performance of a business, as distinct from headline net income.
Quality of Health Care
Quality of health care: the degree to which health services increase desired outcomes consistent with professional knowledge (IOM 1990). Covers Donabedian's structure–process–outcome model, IOM six aims, quality indicators, and OECD/CMS measurement frameworks.
Quality of life
Quality of life (QoL) is a person's own perception of their position in life, covering health, psychology, independence, and relationships, by the World Health Organization's definition.
Quality of service
Quality of service (QoS) is the prioritization of network traffic so that delay- and loss-sensitive applications like voice and video are forwarded as they require.
Quality Record Pressings
Quality Record Pressings is a vinyl record pressing plant in Salina, Kansas, founded in 2011 by Chad Kassem of Acoustic Sounds, pressing about 1.5 million audiophile records a year.
Quality Street (confectionery)
Quality Street is a British assortment of wrapped chocolates and toffees launched in 1936 by Harold Mackintosh in Halifax, named after J.M. Barrie's play, made by Nestlé since 1988, famous for the Purple One, Green Triangle, and Christmas tins.
Quality-adjusted life year
The quality-adjusted life year (QALY) is a health economics unit combining length and quality of life; one QALY equals one year in full health, used by agencies like NICE.
Qualtrics
Qualtrics is an American experience management software company in Provo, Utah, founded in 2002, acquired by SAP for $8 billion, taken public in 2021, and taken private in 2023.
Qualys
Qualys is an American cloud-based security company, founded in 1999 and headquartered in Foster City, California, that provides vulnerability management and compliance software as a service.
Quamina
Quamina, sometimes called Quamina Gladstone (c. 1778 – 1823), was an enslaved African-born carpenter and deacon on Plantation Success, Demerara, now Guyana, prominent in the Demerara Rebellion of 1823.
Quamrul Hassan
Quamrul Hassan (কামরুল হাসান), known as Patua Quamrul Hassan, was a Bangladeshi painter and pioneer of modern art who gave the national flag its present form in 1972.
Quan Âm Thị Kính
Quan Âm Thị Kính is a Vietnamese folk tale and chèo play in which Thị Kính, twice falsely accused, becomes an incarnation of the bodhisattva Quan Âm.
Quận Bốn
Quận Bốn (Quận 4, District 4) was Ho Chi Minh City's smallest, densest island district between the Saigon River and two canals; dissolved 1 July 2025 into Khánh Hội, Vĩnh Hội, and Xóm Chiếu wards.
Quan Cong
Quan Cong (全琮) was a general and official of Eastern Wu who rose from a Qiantang gentry family to become Right Grand Marshal under Sun Quan and married a Wu princess.
Quan Deyu
Quan Deyu (权德舆, 761–818), courtesy name Zaizhi, was a Tang dynasty statesman and writer who served Emperors Dezong and Xianzong, becoming chancellor under Xianzong after drafting imperial edicts.