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Life-Cycle Cost Analysis (LCCA) evaluates all costs and savings associated with a project over its expected life while accounting for the time value of money through discounting future cash flows. This makes it a comprehensive tool for comparing alternatives with different lifespans, operating costs, and benefits. The Simple Payback Period (A) ignores time value, focusing only on recovery time. ROI (C) provides a percentage measure but may not consider discounted cash flows. Average Rate of Return (D) is also based on average profits without discounting. For Certified Energy Managers, LCCA is a cornerstone of financial justification for energy projects, particularly those with long horizons such as renewable installations or deep retrofits. By incorporating discount rates, escalation, and residual values, LCCA enables energy managers to present accurate, defensible analyses to decision-makers and secure funding for energy efficiency initiatives.