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sleep medicine

IRLS

The IRLS is a 10-item clinician-administered rating scale designed to assess the severity of symptoms in patients with restless legs syndrome (RLS). Developed and validated by Walters and colleagues in 2003 for the International Restless Legs Syndrome Study Group, it is the most widely used disease-specific severity me

1 sumber2003

pharmacology

Isobologram Analysis

Isobologram analysis is a graphical and quantitative method for detecting and classifying drug interactions, developed by Salvatore Loewe in 1926. It uses dose-response data from two drugs applied individually and in combination to determine whether their interaction is additive, synergistic, or antagonistic.

2 sumber1926

sports science

Isokinetic Dynamometry

Isokinetic dynamometry measures muscular strength and power production during movement at a constant, preset velocity. Pioneered by Hislop and Perrine (1967), isokinetic testing constrains limb velocity to a fixed speed (e.g., 60°/s or 120°/s), while the dynamometer adjusts resistance to match the subject's force produ

3 sumber1967

spectroscopy

Isothermal Titration Calorimetry

Isothermal Titration Calorimetry (ITC) is a thermodynamic technique that measures heat released or absorbed during biomolecular binding events at constant temperature. Developed by Wiseman and colleagues in 1989, ITC directly determines binding affinity (Kd), enthalpy (ΔH), and entropy (ΔS) in a single experiment, maki

2 sumber1989

geophysics

Isotope Ratio Mass Spectrometry

Isotope Ratio Mass Spectrometry (IRMS) is an analytical technique that measures the relative abundance of stable isotopes (H, C, N, O, S) and some radiogenic isotopes (e.g., ⁸⁷Sr/⁸⁶Sr) in samples with high precision. Standardized by Coplen and colleagues, IRMS enables paleoclimate reconstruction, source tracing (diet,

2 sumber1994

psychometrics

Item Analysis

Item analysis is the foundational psychometric procedure for evaluating the quality of individual test or scale items within the Classical Test Theory (CTT) framework, as systematised by Allen and Yen (1979) and Crocker and Algina (1986). It produces an item difficulty index, an item discrimination index, and a distrac

2 sumber1979

psychometrics

Item Response Theory

Item response theory models the probability that a respondent answers an item correctly (or endorses it) as a function of the respondent's latent trait level and the item's own statistical properties — difficulty, discrimination, and guessing. Unlike classical test theory, IRT places persons and items on the same scale

2 sumber1952

pediatric medicine

ITQOL

The ITQOL is a generic parent-report instrument developed by Landgraf et al. in 1997 to measure health-related quality of life in infants and toddlers aged 2 months to 5 years. Addressing the developmental uniqueness of the very young, the ITQOL captures health-related functioning across domains relevant to early child

2 sumber1997

veterinary science

IVF Embryo Grading

IVF Embryo Grading is a standardized morphological assessment system for evaluating the quality and viability of embryos in assisted reproductive technology. First formalized by Gardner and colleagues in 1999, it uses microscopic examination to score embryos across multiple criteria, enabling clinicians to select the m

3 sumber1999

ophthalmology

IVI

The Impact of Vision Impairment (IVI) scale is a quality-of-life instrument designed specifically for patients with significant vision loss (low vision) to measure the psychological, functional, and social burden of visual impairment. Developed by Wolffsohn, Cochrane, and colleagues (2000), the IVI captures domains inc

2 sumber2000

pediatric medicine

JAFAR

The JAFAR is a parent-report instrument developed by Lovell et al. in 1989 to assess functional ability in children and adolescents with juvenile idiopathic arthritis (JIA). Measuring across multiple domains including lower extremity function, upper extremity function, and activities of daily living, the JAFAR quantifi

2 sumber1989

forestry

Janka Hardness

The Janka hardness test measures wood resistance to indentation and denting by forcing a steel ball into the wood surface under standard load. Developed by Gabriel Janka in 1934, the test is a simple, nondestructive indicator of wood durability, wear resistance, and suitability for flooring, furniture, and other wear-p

2 sumber1934

occupational therapy

JHFT

The Jebsen-Taylor Hand Function Test (JHFT) is a standardized, performance-based measure of hand function developed to provide an objective, quantitative assessment of manual dexterity and hand capability. Created by Jebsen and colleagues (1969) at the University of Minnesota, the JHFT consists of seven timed functiona

2 sumber1969

organizational behavior

Job Content Questionnaire

The Job Content Questionnaire (JCQ), developed by Robert Karasek in 1985, operationalizes the Job Strain Model, a foundational theory linking job characteristics to health outcomes. The JCQ measures job demands, decision latitude (autonomy and skill utilization), social support, and physical exertion. It identifies hig

2 sumber1985

organizational behavior

Job Demands-Resources Scale

The Job Demands-Resources Scale (JDRS) is a multidimensional assessment instrument based on the Job Demands-Resources (JD-R) model, developed by Demerouti and Bakker in 2001. It measures the balance between job demands (workload, time pressure, emotional demands) and resources (autonomy, support, opportunities for grow

2 sumber2001

organizational behavior

Job Descriptive Index

The Job Descriptive Index (JDI) is a comprehensive self-report measure of job satisfaction across five distinct dimensions: work, supervision, coworkers, pay, and promotions. Developed by Smith, Kendall, and Hulin in 1969, it has become one of the most widely used and empirically validated job satisfaction instruments

3 sumber1969

organizational behavior

Job Satisfaction Survey

The Job Satisfaction Survey (JSS) is a 36-item, multidimensional self-report questionnaire developed by Paul Spector in 1985. It assesses nine facets of job satisfaction including pay, promotion, supervision, work itself, fringe benefits, coworkers, communication, working conditions, and management. The JSS has become

2 sumber1985

accounting

Jones Accrual Model

The Jones Accrual Model, developed by Jennifer J. Jones in 1991, is a statistical method for detecting earnings management in financial statements by isolating abnormal accruals. It distinguishes between normal business accruals and potentially manipulated accruals, helping auditors and analysts identify potential fina

2 sumber1991

optics

Jones Calculus

Jones calculus is a mathematical formalism for analyzing the propagation and manipulation of polarized light using vectors and matrices. Developed by Robert Clark Jones in 1941, it represents the electric field of a coherent optical beam as a two-component complex vector (Jones vector) and optical elements as matrices

3 sumber1941

food science

Just-About-Right Scaling

Just-About-Right (JAR) Scaling is a consumer-based sensory evaluation method that asks respondents to rate sensory attributes not on intensity alone, but on whether they perceive the attribute as too weak, just right, or too strong for the product. Developed by Lawless in the mid-1990s, JAR scaling bridges the gap betw

2 sumber1995

human computer interaction

Kano Model

The Kano Model is a framework for categorizing product or service features based on their impact on customer satisfaction. Developed by Noriaki Kano, this model distinguishes three types of features: basic (must-have) features that satisfy minimally but cause significant dissatisfaction if absent; performance features

2 sumber1984

cardiology

Kansas City Cardiomyopathy Questionnaire

The Kansas City Cardiomyopathy Questionnaire (KCCQ) is a 23-item, multidimensional self-report measure that evaluates heart failure-related symptoms, functional limitations, and quality of life in patients with cardiomyopathy and heart failure of all severities. Developed by Spertus and colleagues in 2000, the KCCQ pro

1 sumber2000

food science

Karl Fischer Titration

Karl Fischer Titration (KFT) is a precise analytical method for determining water content in food and pharmaceutical products. Developed by Karl Fischer in 1935, KFT uses a chemical reaction between water and an iodine-based titrant, allowing quantification of moisture with exceptional accuracy and sensitivity. KFT is

2 sumber1935

nursing

Katz Index of Independence in ADL

The Katz Index of Independence in Activities of Daily Living, developed by Sidney Katz and colleagues in 1963, is one of the earliest and most widely used tools for assessing functional status in older adults and persons with chronic illness. The scale evaluates six essential self-care activities (bathing, dressing, to

2 sumber1963

forestry

Keetch-Byram Drought Index

The Keetch-Byram Drought Index (KBDI) is a cumulative drought severity index used in fire danger rating systems to track long-term soil moisture depletion and drying trends. Developed in 1968 by Keetch and Byram, KBDI integrates daily temperature, precipitation, and prior drought state to produce a continuous index ran

2 sumber1968

clinical psychology

Kessler Psychological Distress Scale

The Kessler Psychological Distress Scale-10 (K10) is a 10-item self-report measure of non-specific psychological distress and mental health problems. Developed by Kessler and colleagues in 2002, the K10 was designed as an ultra-brief screening instrument for population surveys and epidemiological research. A shorter 6-

2 sumber2002

food science

Kjeldahl Method

The Kjeldahl Method is a classical analytical procedure for determining the total nitrogen content of food products, developed by Johan Kjeldahl in 1883. By measuring total nitrogen and applying a conversion factor specific to the food type, the method indirectly determines crude protein content. Kjeldahl remains the o

2 sumber1883

forestry

Klason Lignin

The Klason lignin method is a standard chemical test for quantifying the acid-insoluble lignin content in wood and plant biomass. Developed by Erik Klason in 1908, the method treats wood with sulfuric acid to dissolve carbohydrates (cellulose and hemicellulose) while leaving the acid-insoluble lignin residue. Klason li

2 sumber1908

human computer interaction

KLM-GOMS

The Keystroke-Level Model (KLM), part of the Goals-Operators-Methods-Selection rules (GOMS) framework, is a computational method for predicting how long a user will take to accomplish a routine task using an interactive system. Developed by Card, Moran, and Newell in 1983, KLM decomposes user actions into primitive ope

2 sumber1983

rehabilitation

Knee Injury and Osteoarthritis Outcome Score

The Knee Injury and Osteoarthritis Outcome Score (KOOS) is a patient-reported outcome measure designed for active patients with knee injury and osteoarthritis. Developed by Roos and colleagues in 1998, KOOS extends assessment beyond traditional osteoarthritis scales to include symptoms, pain, function in daily living,

2 sumber1998

strategic management

Knowledge Management Capability Scale

Knowledge Management (KM) refers to the organizational capacity to create, capture, organize, and apply knowledge to improve organizational effectiveness, innovation, and decision-making. Nonaka and Takeuchi's (1995) knowledge-creating company framework conceptualized knowledge as moving through four conversion modes:

3 sumber1995

organizational behavior

Knowledge Sharing Scale

The Knowledge Sharing Scale (KSS) is an 18-item instrument measuring employee intention to share knowledge and experience within organizations. Developed by Bock, Zmud, Kim, and Lee in 2005, the KSS assesses barriers and enablers of knowledge sharing behavior across six dimensions: perceived usefulness, extrinsic motiv

2 sumber2005

sports science

Lactate Threshold (OBLA)

Lactate threshold, also termed the onset of blood lactate accumulation (OBLA), is the exercise intensity at which blood lactate concentration increases rapidly and non-linearly. Initially defined by Klaus Wasserman in 1973, the concept describes the physiological transition from aerobic to anaerobic metabolism. As exer

3 sumber1973

neurology

LANSS

The LANSS is a brief seven-item hybrid screening and diagnostic tool designed to differentiate neuropathic pain from non-neuropathic (nociceptive) pain. Developed by Mark Bennett at the University of Leeds in 2001, it combines five patient-reported symptom items with two clinician-performed neurological examination fin

1 sumber2001

nursing

Lawton-Brody Instrumental ADL Scale

The Lawton-Brody Instrumental Activities of Daily Living (IADL) Scale, developed by M. Powell Lawton and Elaine M. Brody in 1969, measures the capacity to perform complex, higher-order self-care and household tasks necessary for independent community living. The scale assesses eight domains (for women) or five domains

2 sumber1969

organizational behavior

Leader-Member Exchange Scale

The Leader-Member Exchange Scale (LMX-7) measures the quality of the working relationship between a supervisor and employee. Developed by Graen and Uhl-Bien in 1995, it is a brief, widely adopted instrument grounded in Leader-Member Exchange theory. The scale captures mutual trust, respect, and obligation—the psycholog

3 sumber1995

agronomy

Leaf Area Index

Leaf Area Index (LAI) is a dimensionless quantity that measures the total one-sided area of leaves per unit ground area covered by a canopy. It quantifies canopy density and structure: LAI = 0 for bare soil, LAI = 1 for a thin crop, LAI = 3-6 for dense cereal or grass canopies, and LAI > 8 for dense forest. LAI is a ke

3 sumber1947

ecology

Leslie Matrix

The Leslie matrix is a deterministic model of age-structured population dynamics, introduced by Patrick Leslie (1945). It projects population size and structure forward in time using age-specific fertility and survival rates. A Leslie matrix encodes these vital rates in a square matrix; multiplying the matrix by a popu

3 sumber1945

psychology

Lexical Decision Task

The Lexical Decision Task is a computerized measure of word recognition and semantic processing. Participants judge whether letter strings are real words or nonwords (pronounceable but meaningless letter combinations). Response times and accuracy reveal how quickly people access word meanings, how semantic relatedness

3 sumber1971

remote sensing

LiDAR Analysis

LiDAR (Light Detection and Ranging) Point-Cloud Analysis is an active remote sensing technique that measures distances by emitting laser pulses and recording the time for returns to reach the sensor. First systematically applied to ecosystem science by Lefsky, Cohen, Parker, and Harding in 2002, LiDAR produces dense th

1 sumber2002

clinical psychology

Liebowitz Social Anxiety Scale

The Liebowitz Social Anxiety Scale (LSAS) is a 24-item clinician-administered scale designed to measure the severity of social anxiety and avoidance in individuals with social anxiety disorder. Developed by Michael R. Liebowitz in 1987, the LSAS has become the gold-standard instrument for assessing social phobia in cli

1 sumber1987

sustainability

Life Cycle Assessment

Life Cycle Assessment is a systematic, ISO-standardized methodology for quantifying the environmental impacts of a product, process, or service across its entire life span — from raw material extraction through production, use, and end-of-life disposal. Codified in ISO 14040 and ISO 14044, and comprehensively reviewed

1 sumber2009

sustainability

Life Cycle Sustainability Assessment

Life Cycle Sustainability Assessment (LCSA) is a comprehensive framework developed by Matthias Finkbeiner and colleagues to evaluate environmental, social, and economic impacts of products and services throughout their entire life cycle. Introduced around 2008, it extends traditional life cycle assessment to address su

3 sumber2008

trauma psychology

Life Events Checklist for DSM-5

The LEC-5 is a 17-item self-report checklist assessing exposure to stressful life events that may result in PTSD or trauma-related mental health problems. Developed by Weathers and colleagues at the National Center for PTSD in 2013, the LEC-5 identifies which types of traumatic events a person has experienced, determin

2 sumber2013

positive psychology

Life Orientation Test Revised

The Life Orientation Test – Revised (LOT-R) is a 10-item measure of dispositional optimism developed by Scheier, Carver, and Bridges in 1994. It assesses the general expectancy that good things (versus bad things) will happen in the future. Optimism, as measured by the LOT-R, predicts coping success, health outcomes, a

1 sumber1994

chemistry

Ligand Field Analysis

Ligand Field Theory (LFT) is an advanced model of metal-ligand bonding that combines crystal field theory with molecular orbital theory. Developed systematically by Brian Norman Figgis and others from the 1960s onward, LFT provides quantitative predictions of electronic structure, magnetism, spectra, and reactivity of

2 sumber1960

psychometrics

Likert Scale Construction

Likert scale construction is a systematic methodology for developing attitude measurement instruments using summated rating scales. Introduced by Rensis Likert in 1932, it enables researchers to quantify latent constructs such as attitudes, beliefs, and psychological states by aggregating responses across multiple item

3 sumber1932

sampling

Line-Intercept Sampling

Line-Intercept Sampling (LIS) is an ecological field method developed by Richard H. Canfield in 1941 for estimating vegetation cover, plant density, and structural characteristics in rangeland and forest surveys. By laying a linear transect across a study area and recording all plants intersecting the line, LIS provide

3 sumber1941

sports science

Link Segment Inverse Dynamics

Inverse dynamics is a biomechanical analysis technique that calculates joint moments (forces and torques) from measured kinematics (positions and angles) and ground reaction forces. Formalized by David Winter (1990), inverse dynamics works backward from Newton's second law: given acceleration and inertia, calculate the

3 sumber1990

psychiatric rehabilitation

Link Stigma Scale

The Link Stigma Scale, also called the Perceived Devaluation-Discrimination Scale, is a measure of perceived stigma developed by Bruce G. Link in 1987. It assesses the extent to which individuals with serious mental illness perceive that society devalues people with mental illness and discriminates against them. Unlike

1 sumber1987

pharmacology

Liposome Encapsulation

Liposomal encapsulation is a formulation technique using lipid bilayer vesicles (liposomes) to enclose drugs, improving bioavailability, reducing toxicity, and enabling targeted delivery. Developed by Alec Bangham in 1965, liposomes are now standard in pharmaceutical development, with several FDA-approved liposomal dru

2 sumber1965

biomaterials

Live/Dead Assay

The Live/Dead assay is a fluorescence-based method for simultaneously identifying live and dead cells using two complementary dyes. The assay combines calcein-AM (or SYTO fluorophores), which generates bright green fluorescence in living cells with intact esterase activity, with propidium iodide (PI), which produces re

3 sumber2000

sustainability

LMDI Decomposition

Log-Mean Divisia Index (LMDI) Decomposition is a quantitative technique for attributing changes in an aggregate indicator — most commonly energy consumption or CO₂ emissions — to its underlying driving factors, such as activity level, structural mix, and intensity. Introduced in its definitive practical form by B. W. A

1 sumber2005

psychometrics

Longitudinal Construct Validity

Longitudinal construct validity evaluates whether a psychological scale measures the same latent construct in the same way across multiple time points. It is tested by progressively constraining a confirmatory factor model across waves and comparing model fit, ensuring that observed change scores reflect genuine change

2 sumber1993

psychometrics

Longitudinal content validity

Longitudinal content validity evaluates whether the items of a measure adequately and consistently represent the intended content domain not only at a single point in time but across repeated administrations. It ensures that the conceptual coverage of a scale remains appropriate and stable as measurement occasions accu

2 sumber1995

psychometrics

Longitudinal convergent validity

Longitudinal convergent validity evaluates whether a scale's indicators correlate with theoretically related constructs not just at a single time point but consistently across repeated measurement occasions. It extends standard convergent validity testing into longitudinal designs to ensure that the scale measures the

2 sumber1997

survey methodology

Longitudinal Diary Method

The Longitudinal Diary Method is a data collection technique in which participants record experiences, thoughts, feelings, or behaviors in structured diary entries repeatedly over an extended period — from days to months or even years. Unlike a one-shot survey, it tracks within-person change, daily fluctuation, and tem

2 sumber1942

psychometrics

Longitudinal DIF

Longitudinal differential item functioning detects whether individual test or scale items behave differently across measurement occasions for the same respondents. It extends standard DIF methodology to repeated-measures designs, ensuring that observed change scores genuinely reflect construct change rather than shifts

2 sumber1980

psychometrics

Longitudinal Discriminant Validity

Longitudinal discriminant validity tests whether a psychological construct measured at two or more time points is empirically distinct across occasions — ensuring that the same construct does not collapse into a single undifferentiated mass over time. It is a prerequisite for meaningful change modeling in panel and lon

2 sumber1993

survey methodology

Longitudinal Focus Group

A longitudinal focus group convenes the same group of participants in multiple sessions over an extended period — weeks, months, or years — to trace how their attitudes, experiences, or interpretations evolve in response to changing circumstances. Unlike a single focus group snapshot, the repeated-contact design captur

2 sumber1940

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