পদ্ধতির তুলনা করুন

	রক্ষণাবেক্ষণ অপ্টিমাইজেশান	Six Sigma DMAIC	ভ্যালু স্ট্রিম ম্যাপিং (VSM)
ক্ষেত্র	নির্ভরযোগ্যতা	মান ব্যবস্থাপনা	মান ব্যবস্থাপনা
পরিবার	Process / pipeline	Process / pipeline	Process / pipeline
উদ্ভবের বছর	2002	2014	1999
প্রবর্তক	Hongzhou Wang	Motorola; Pyzdek & Keller	Mike Rother & John Shook
ধরন	decision optimization framework	Structured process improvement methodology	Visual process analysis tool
মৌলিক উৎস	Wang, H. (2002). A survey of maintenance policies of deteriorating systems. European Journal of Operational Research, 139(3), 469–489.	Pyzdek, T., & Keller, P. (2014). The Six Sigma Handbook (4th ed.). McGraw-Hill. ISBN: 978-0-07-184053-9	Rother, M., & Shook, J. (1999). Learning to See: Value Stream Mapping to Add Value and Eliminate Muda. Lean Enterprise Institute. ISBN: 978-0-9667843-0-5
অপর নাম	Optimal Maintenance Policy, Preventive Maintenance Scheduling, Predictive Maintenance Optimization, Bakım Optimizasyonu	DMAIC Framework, Six Sigma Process Improvement Cycle, Define-Measure-Analyze-Improve-Control, Altı Sigma DMAIC	VSM, Material and Information Flow Mapping, Lean Flow Mapping, Değer Akış Haritalama
সম্পর্কিত	3	3	3
সারসংক্ষেপ	Maintenance Optimization is a quantitative framework for determining the timing, type, and frequency of maintenance actions—preventive, predictive, or corrective—that minimize total cost or expected downtime over a system's operational life. Systematic formulations were consolidated by Hongzhou Wang (2002), whose survey unified age-replacement, block-replacement, and imperfect-repair policies under a common cost-rate structure applicable to deteriorating systems across engineering and operations management.	Six Sigma DMAIC is a data-driven, five-phase process improvement methodology — Define, Measure, Analyze, Improve, and Control — used to reduce defects and process variation to fewer than 3.4 defects per million opportunities. Originating at Motorola in the 1980s and systematized by practitioners including Pyzdek and Keller, it is widely adopted in manufacturing, healthcare, finance, and service industries seeking sustained quality gains.	Value Stream Mapping (VSM) is a lean management technique used to visualize, analyze, and improve the flow of materials and information required to bring a product or service from raw input to customer delivery. Introduced by Mike Rother and John Shook in their 1999 workbook Learning to See, VSM draws on the Toyota Production System tradition to expose waste, delays, and non-value-adding activities across the entire production value stream.