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GREY-PROMETHEE (Grey-PROMETHEE — Grey extension of PROMETHEE) is a outranking multi-criteria decision-making (MCDM) method introduced by Li, P., Wei, C. in 2011. It turns a decision matrix of alternatives scored on multiple criteria into a structured, reproducible result.
GREY-SAW (Grey-SAW — Grey extension of SAW) is a ranking multi-criteria decision-making (MCDM) method introduced by Fishburn, P. C. in 1967. It turns a decision matrix of alternatives scored on multiple criteria into a structured, reproducible result.
GREY-TODIM (Grey-TODIM — Grey extension of TODIM) is a ranking multi-criteria decision-making (MCDM) method introduced by Gomes, L. F. A. M., Lima, M. M. P. P. in 1992. It turns a decision matrix of alternatives scored on multiple criteria into a structured, reproducible result.
GREY-TOPSIS (Grey-TOPSIS — Grey extension of TOPSIS) is a ranking multi-criteria decision-making (MCDM) method introduced by Zavadskas, E. K., Turskis, Z., Bagocius, V. in 2015. It turns a decision matrix of alternatives scored on multiple criteria into a structured, reproducible result.
GREY-VIKOR (Grey-VIKOR — Grey extension of VIKOR) is a ranking multi-criteria decision-making (MCDM) method introduced by Chang, C. L., Liu, P. H., Wei, C. C. in 2001. It turns a decision matrix of alternatives scored on multiple criteria into a structured, reproducible result.
GREY-WASPAS (Grey-WASPAS — Grey extension of WASPAS) is a ranking multi-criteria decision-making (MCDM) method introduced by Zavadskas, E. K., Turskis, Z., Antucheviciene, J., Zakarevicius, A. in 2012. It turns a decision matrix of alternatives scored on multiple criteria into a structured, reproducible result.
The Hamilton-Jacobi-Bellman (HJB) equation is a partial differential equation characterizing the optimal cost-to-go function in dynamic programming. Developed by Bellman in 1957, HJB provides both necessary and sufficient conditions for optimality, enabling elegant theoretical analysis and numerical solutions for optim
Harmony Search (HS) is a population-based metaheuristic optimization algorithm introduced by Geem, Kim, and Loganathan in 2001. It mimics the improvisation process of jazz musicians seeking a perfect state of harmony, using three operators — memory consideration, pitch adjustment, and random selection — to generate can
Harris Hawks Optimization (HHO) is a metaheuristic algorithm introduced by Heidari et al. in 2019, inspired by the hunting strategies of Harris's hawks. The algorithm models the cooperative hunting behavior and escape strategies of these raptors to solve complex optimization problems. HHO balances exploration through p
Haversine distance measures the great-circle distance between two points on a sphere given their latitude and longitude coordinates. Popularized by Roger Sinnott in 1984, this formula computes the shortest distance between two points on Earth's surface, accounting for the planet's spherical geometry. It ranges from 0 (
The Health Anxiety Inventory (HAI) is a 14-item self-report questionnaire designed to measure health anxiety and health-related worry, including concerns about having serious illness, fear of dying, and preoccupation with bodily symptoms. Developed by Salkovskis, Rimes, Warwick, and Clark in 2002, the HAI has become a
Hellinger distance is a symmetric, bounded metric that measures the difference between two probability distributions. Rooted in the work of Ernst Hellinger (1909) and later formalized in statistical divergence by Anil Bhattacharyya (1946), this distance ranges from 0 (identical distributions) to 1. It is a true metric
HELLWIG (Hellwig's Method — Development Pattern) is a ranking multi-criteria decision-making (MCDM) method introduced by Hellwig, Z. in 1968. It turns a decision matrix of alternatives scored on multiple criteria into a structured, reproducible result.
HERONIAN-MEAN (Heronian Mean (HM)) is a aggregation multi-criteria decision-making (MCDM) method introduced by Yu, D. in 2012. It turns a decision matrix of alternatives scored on multiple criteria into a structured, reproducible result.
HF-AHP (Hesitant Fuzzy AHP (AHP-Hesitant Group Decision Making via HMPM)) is a weight subjective multi-criteria decision-making (MCDM) method introduced by Zhu, B., Xu, Z. in 2014. It turns a decision matrix of alternatives scored on multiple criteria into a structured, reproducible result.
HF-ARAS (Hesitant Fuzzy Additive Ratio Assessment) is a ranking multi-criteria decision-making (MCDM) method introduced by Mishra, A. R., Rani, P., Krishankumar, R., Ravichandran, K. S., Kar, S. in 2021. It turns a decision matrix of alternatives scored on multiple criteria into a structured, reproducible result.
HF-CODAS (Hesitant extension of HF-CODAS) is a ranking multi-criteria decision-making (MCDM) method introduced by Torra, V. in 2010. It turns a decision matrix of alternatives scored on multiple criteria into a structured, reproducible result.
HF-COPRAS (Hesitant Fuzzy Complex Proportional Assessment) is a ranking multi-criteria decision-making (MCDM) method introduced by Mishra, A.R., Rani, P., Pardasani, K.R. in 2018. It turns a decision matrix of alternatives scored on multiple criteria into a structured, reproducible result.
HF-DFT (Hesitant Fuzzy Decision Field Theory (Song-Xu 2021)) is a ranking multi-criteria decision-making (MCDM) method introduced by Song, C. Zhang, Y. Xu, Z. S. Hao, Z. Wang, X. in 2019. It turns a decision matrix of alternatives scored on multiple criteria into a structured, reproducible result.
HF-EDAS (Hesitant Fuzzy EDAS (Evaluation Based on Distance from Average Solution)) is a ranking multi-criteria decision-making (MCDM) method introduced by Kutlu Gündoğdu, F.; Kahraman, C.; Civan, H. (HF-EDAS); Keshavarz Ghorabaee, M. et al. 2015 (base EDAS); Yu, D. 2014 (TFHFS value-space) in 2018. It turns a decision
HF-ELECTRE-I (HF-ELECTRE I — Hesitant Fuzzy ELECTRE I (Chen-Xu-Xia 2015)) is a outranking multi-criteria decision-making (MCDM) method introduced by Chen, N. Xu, Z. S. Xia, M. M. in 2015. It turns a decision matrix of alternatives scored on multiple criteria into a structured, reproducible result.
HF-ELECTRE-II (HF-ELECTRE II — Hesitant Fuzzy ELECTRE II (Chen-Xu 2015)) is a outranking multi-criteria decision-making (MCDM) method introduced by Chen, N. Xu, Z. S. in 2015. It turns a decision matrix of alternatives scored on multiple criteria into a structured, reproducible result.
HF-GRA (Hesitant Fuzzy Grey Relational Analysis) is a ranking multi-criteria decision-making (MCDM) method introduced by Li, X., Wei, G. in 2014. It turns a decision matrix of alternatives scored on multiple criteria into a structured, reproducible result.
HF-MABAC (Hesitant Fuzzy Multi-Attributive Border Approximation area Comparison) is a ranking multi-criteria decision-making (MCDM) method introduced by Mishra, A.R., Saha, A., Rani, P., Pamucar, D., Dutta, D., Hezam, I.M. in 2022. It turns a decision matrix of alternatives scored on multiple criteria into a structured
HF-MARCOS (Hesitant Fuzzy MARCOS) is a ranking multi-criteria decision-making (MCDM) method introduced by Li, G., Geng, X., Yuan, Y. in 2020 crisp; 2023 variant applicator. It turns a decision matrix of alternatives scored on multiple criteria into a structured, reproducible result.
HF-MAXSCORE-PORT (HF-MaxScore-Portfolio — Hesitant Fuzzy Maximum-Score Portfolio Selection (Zhou-Xu 2018)) is a portfolio multi-criteria decision-making (MCDM) method introduced by Zhou, W. Xu, Z. in 2018. It turns a decision matrix of alternatives scored on multiple criteria into a structured, reproducible result.
HF-MOORA (Hesitant Fuzzy Multi-Objective Optimization by Ratio Analysis) is a ranking multi-criteria decision-making (MCDM) method introduced by Li, Z.-H. in 2014. It turns a decision matrix of alternatives scored on multiple criteria into a structured, reproducible result.
HF-QUALIFLEX (Hesitant Fuzzy extension of QUALIFLEX) is a outranking multi-criteria decision-making (MCDM) method introduced by Zhang, Z. X. Xu, Z. S. in 2015. It turns a decision matrix of alternatives scored on multiple criteria into a structured, reproducible result.
HF-SAW (Hesitant extension of HF-SAW) is a ranking multi-criteria decision-making (MCDM) method introduced by Torra, V. in 2010. It turns a decision matrix of alternatives scored on multiple criteria into a structured, reproducible result.
HF-TODIM (Hesitant Fuzzy TODIM via new measure function Z_δ (Zhang-Xu 2016 ITOR)) is a ranking multi-criteria decision-making (MCDM) method introduced by Zhang, Y., Xu, Z. in 2016. It turns a decision matrix of alternatives scored on multiple criteria into a structured, reproducible result.
HF-TOPSIS (Hesitant Fuzzy TOPSIS with optional incomplete weight information (Xu-Zhang 2013 KBS)) is a ranking multi-criteria decision-making (MCDM) method introduced by Xu, Z., Zhang, X. in 2013. It turns a decision matrix of alternatives scored on multiple criteria into a structured, reproducible result.
HF-TRADEOFF-PORT (HF-TradeOff-Portfolio — Hesitant Fuzzy Score-Deviation Trade-Off Portfolio Selection (Zhou-Xu 2018)) is a portfolio multi-criteria decision-making (MCDM) method introduced by Zhou, W. Xu, Z. in 2018. It turns a decision matrix of alternatives scored on multiple criteria into a structured, reproducible
HF-VIKOR (Hesitant Fuzzy VIKOR (Liao-Xu 2013)) is a ranking multi-criteria decision-making (MCDM) method introduced by ? in 2013. It turns a decision matrix of alternatives scored on multiple criteria into a structured, reproducible result.
HF-WASPAS (Hesitant Fuzzy Weighted Aggregated Sum Product Assessment) is a ranking multi-criteria decision-making (MCDM) method introduced by Mishra, A.R., Rani, P., Pardasani, K.R., Mardani, A. in 2019. It turns a decision matrix of alternatives scored on multiple criteria into a structured, reproducible result.
HFEA (Hesitant Fuzzy Envelopment Analysis (DHFEA / SHFEA, Zhou-Chen-Xu-Meng 2018)) is a dea multi-criteria decision-making (MCDM) method introduced by Zhou, W. Chen, J. Xu, Z. S. Meng, S. in 2018. It turns a decision matrix of alternatives scored on multiple criteria into a structured, reproducible result.
HFGPE (Hesitant Fuzzy Generalized Peer-Evaluation (strategy-blended cross-efficiency with BFM, Zhou-Chen-Xu-Meng 2018)) is a dea multi-criteria decision-making (MCDM) method introduced by Zhou, W. Chen, J. Xu, Z. S. Meng, S. in 2018. It turns a decision matrix of alternatives scored on multiple criteria into a structur
HFL-AHP (Hesitant Fuzzy Linguistic AHP (HFLTS-envelope family: Yavuz 2015 + Özdağoğlu 2018)) is a weight subjective multi-criteria decision-making (MCDM) method introduced by Yavuz, M., Öztaysi, B., Çevik Onar, S., Kahraman, C. in 2015. It turns a decision matrix of alternatives scored on multiple criteria into a struc
HFL-CODAS (Hesitant Fuzzy Linguistic CODAS (HFLTS-envelope, Combinative Distance-based Assessment)) is a ranking multi-criteria decision-making (MCDM) method introduced by Yalçın, N., Pehlivan, N.Y. in 2019. It turns a decision matrix of alternatives scored on multiple criteria into a structured, reproducible result.
HFL-MABAC (Hesitant Fuzzy Linguistic Projection-Based MABAC with Bonferroni Mean (Sun et al. 2018)) is a ranking multi-criteria decision-making (MCDM) method introduced by Sun, R., Hu, J., Zhou, J., Chen, X. in 2018. It turns a decision matrix of alternatives scored on multiple criteria into a structured, reproducible
HFL-PROMETHEE (Hesitant Fuzzy Linguistic PROMETHEE (Liang-Wang-Zhang 2018)) is a outranking multi-criteria decision-making (MCDM) method introduced by Liang, R. X. Wang, J. Q. Zhang, H. Y. in 2018. It turns a decision matrix of alternatives scored on multiple criteria into a structured, reproducible result.
HFLPR-PRIORITY (Hesitant Fuzzy Linguistic Preference Relation Priority Programming (Ren-Zhu-Xu 2018)) is a preference relations multi-criteria decision-making (MCDM) method introduced by Ren, P. J. Zhu, B. Xu, Z. S. in 2018. It turns a decision matrix of alternatives scored on multiple criteria into a structured, repro
HFPE (Hesitant Fuzzy Peer-Evaluation (benevolent / aggressive cross-efficiency, Zhou-Chen-Xu-Meng 2018)) is a dea multi-criteria decision-making (MCDM) method introduced by Zhou, W. Chen, J. Xu, Z. S. Meng, S. in 2018. It turns a decision matrix of alternatives scored on multiple criteria into a structured, reproducibl
HFPEA (Hesitant Fuzzy Preference Envelopment Analysis (DHFPEA / SHFPEA, Zhou-Chen-Xu-Meng 2018)) is a dea multi-criteria decision-making (MCDM) method introduced by Zhou, W. Chen, J. Xu, Z. S. Meng, S. in 2018. It turns a decision matrix of alternatives scored on multiple criteria into a structured, reproducible result
The Hearing Handicap Inventory for Adults (HHIA) is a 25-item self-report questionnaire that quantifies the functional and emotional effects of hearing loss on daily life, work, and psychosocial well-being. Developed by Newman, Weinstein, Jacobson, and Hug in 1990, the HHIA is the most widely used hearing-specific qual
The Holistic Caring Inventory (HCI) is a clinical assessment tool measuring nurses' and healthcare providers' capacity to deliver holistic, person-centered care that integrates physical, emotional, spiritual, and social dimensions. Developed in the context of Watson's theory of human caring, it operationalizes the phil
The Honey Badger Algorithm (HBA) is a nature-inspired metaheuristic optimization algorithm presented by Hashim et al. in 2023, modeled on the hunting behavior and intelligent strategies of honey badgers (Mellivora capensis). Honey badgers are known for their remarkable problem-solving abilities, fearlessness, and persi
Hybrid Six Sigma DMAIC combines the rigorous five-phase DMAIC cycle (Define, Measure, Analyze, Improve, Control) with complementary methodologies — most commonly Lean principles, Agile practices, or Design Thinking — to address quality defects and process inefficiencies simultaneously. By integrating speed-focused tool
Hyper-heuristics are high-level methodologies that search over a space of heuristics rather than directly over the space of solutions. Introduced systematically by Burke et al. (2013) in their landmark survey, hyper-heuristics operate by selecting or generating low-level heuristics to solve hard combinatorial optimisat
The Hyperthyroidism Symptom Checklist is a structured assessment tool for quantifying the symptom burden of Graves' disease and other thyrotoxicosis conditions. It captures the multisystem manifestations of excess thyroid hormone: cardiovascular (palpitations, tachycardia, arrhythmia), neuropsychiatric (anxiety, tremor
The Inventory of Complicated Grief (ICG) is a 19-item self-report measure developed by Prigerson and colleagues in 1995 to assess complicated grief—a persistent, impairing form of grief that goes beyond typical bereavement. Designed to distinguish complicated grief from bereavement-related depression, the ICG has becom
IDOCRIW (Integrated Determination of Objective CRIteria Weights) is a weight objective multi-criteria decision-making (MCDM) method introduced by Zavadskas, E. K., Podvezko, V. in 2012. It turns a decision matrix of alternatives scored on multiple criteria into a structured, reproducible result.
IF-ARAS (Intuitionistic Fuzzy ARAS) is a ranking multi-criteria decision-making (MCDM) method introduced by Atanassov, K. T. in 1986. It turns a decision matrix of alternatives scored on multiple criteria into a structured, reproducible result.
IF-COCOSO (IF-CoCoSo — Intuitionistic extension of COCOSO) is a ranking multi-criteria decision-making (MCDM) method introduced by Atanassov, K. T. in 1986. It turns a decision matrix of alternatives scored on multiple criteria into a structured, reproducible result.
IF-CODAS (TIF-CODAS — Triangular Intuitionistic Fuzzy Group CODAS (TIFN-CODAS)) is a ranking multi-criteria decision-making (MCDM) method introduced by Daami Remadi, F., Moalla Frikha, H. in 2020. It turns a decision matrix of alternatives scored on multiple criteria into a structured, reproducible result.
IF-CODAS-SORT (Intuitionistic Fuzzy CODAS-SORT (sorting via Euclidean+Hamming relative assessment)) is a sorting multi-criteria decision-making (MCDM) method introduced by Ouhibi, A. Moalla Frikha, H. in 2021. It turns a decision matrix of alternatives scored on multiple criteria into a structured, reproducible result.
IF-COPRAS (Intuitionistic extension of COPRAS) is a ranking multi-criteria decision-making (MCDM) method introduced by Atanassov, K. T. in 1986. It turns a decision matrix of alternatives scored on multiple criteria into a structured, reproducible result.
IF-DFT (Intuitionistic Fuzzy Decision Field Theory (Hao-Xu-Zhao-Zhang 2017)) is a ranking multi-criteria decision-making (MCDM) method introduced by Hao, Z. N. Xu, Z. S. Zhao, H. Zhang, R. in 2017. It turns a decision matrix of alternatives scored on multiple criteria into a structured, reproducible result.
IF-EDAS (Intuitionistic Fuzzy EDAS) is a ranking multi-criteria decision-making (MCDM) method introduced by Atanassov, K. T. in 1986. It turns a decision matrix of alternatives scored on multiple criteria into a structured, reproducible result.
IF-ENTROPY (Intuitionistic Fuzzy Entropy Weight Method (Vlachos-Sergiadis 2007 entropy measure as applied by Hung-Chen 2010)) is a weight objective multi-criteria decision-making (MCDM) method introduced by Atanassov, K. T. in 1986. It turns a decision matrix of alternatives scored on multiple criteria into a structure
IF-GRA (Intuitionistic extension of GRA) is a ranking multi-criteria decision-making (MCDM) method introduced by Atanassov, K. T. in 1986. It turns a decision matrix of alternatives scored on multiple criteria into a structured, reproducible result.