This guide discusses zero-based budgeting (ZBB) and its application in marketing. It explains that ZBB requires every line item in a budget to justify its relevance, thus eliminating unnecessary expenditures. The document emphasizes the need for aligning budgets with current goals and strategies rather than relying on previous years' trends. It outlines the challenges associated with ZBB, particularly the complexity of managing multiple spreadsheets, outdated performance metrics, and hidden costs. The guide notes that ZBB is a rigorous budgeting method that aims to ensure all spending is backed by data and strategic objectives, as opposed to subjective decision-making. Modern tools are introduced as solutions to streamline the ZBB process, making it more efficient and less cumbersome for finance and planning teams. By utilizing these tools, organizations can gain clearer insights into their spending, allowing for early identification of waste and improved alignment of budgets with business goals.