The document discusses cost-volume-profit (CVP) analysis, a management accounting tool for profit planning that examines relationships between selling price, variable costs, and sales volume. It highlights break-even analysis, which determines the sales volume at which total revenue equals total costs, and includes various illustrations demonstrating the calculation of break-even points and the impact of cost changes on profitability. Additionally, it addresses operating leverage and its effect on profit fluctuations in response to sales changes.