This document discusses break even analysis, including cost-volume-profit (CVP) analysis, contribution, break even point, margin of safety, and break even charts. It defines key terms like contribution, break even point, and margin of safety. The break even point is where total sales equal total variable costs plus fixed costs. Margin of safety is the point above which profit is made. Break even charts graphically show the break even point and relationship between costs, sales, and activity levels. The document also covers multi-product break even analysis and the limitations of CVP analysis.