SEARCH Articles Figures Tables Assessment of existing management systems Assessment of existing prevention and monitoring systems Compatibility with existing computer systems Complex Reaction Systems The Existence of Parallel and Consecutive Reactions Energy system existing Equilibrium systems existence/uniqueness Existence of Lipschitz Tori for Nonlinear Systems with Lag Existing Management Systems Existing management systems, assessment Existing management systems, chemical Fine Tuning Existing Systems Hazardous waste system, existing chemical Network Pinch—The Bottleneck of Existing Heat Recovery System Non-conformance of Existing Pressure Relief Systems OTHER SIGNIFICANT DIFFERENCES FROM EXISTING SYSTEMS Regulatory System Existing in the USA Saving Energy in Existing Hydraulic Systems Several Systems Exist for DNA Repair Strategies for Bringing Existing Systems into Compliance Summary of Existing Waste Classification Systems Techno-economic Analysis of Hydrogen Technologies Integration in Existing Conventional Autonomous Power Systems - Case Studies The Need for Assessing Existing Management Systems Waste classification system existing chemical Waste classification system existing radioactive