Cash flow changes can result from various sources, such as sales volume, pricing, costs, inventory, accounts receivable, accounts payable, taxes, debt, equity, investments, and dividends. Some of these sources are under your control, while others are influenced by market conditions, customer behavior, supplier terms, regulations, and competitors. Some of these sources are positive, meaning they increase your cash inflow, while others are negative, meaning they decrease your cash inflow or increase your cash outflow. You need to monitor and measure the impact of these sources on your cash flow regularly, and identify the trends, patterns, and anomalies that affect your cash flow performance.