What are the main sales forecasting methods and when does each one work?
The seven methods every mature revenue org eventually uses are rep commit (the number the rep stands behind, captures seller conviction and local knowledge), best case (everything that could close including stretch deals), pipeline coverage (total pipeline divided by target, healthy range 3x to 5x), weighted stage (each stage multiplied by its historical win rate, the most common B2B method), time series (last four to eight quarters extrapolated forward with trend and seasonality), regression (multi-factor model fit to closed-won history), and scenario (best, likely, worst with the plan behind each). Each has specific failure modes. Rep commit fails under sandbagging or over-promising pressure. Weighted stage fails when close rates vary by segment or deal age. Time series fails on new segments or disruptive events. The mature forecast runs multiple methods side by side with reconciliation.