Build a best, base, and worst case scenario model in Excel

Help me build a scenario model in Excel from my assumptions. What the model needs to answer: [e.g. "next year's profit", "whether the new hire pays for itself", "cash at the end of Q4"] Key assumptions and my base values: [LIST - e.g. "price $120", "volume 4,000 units/month", "churn 3%", "start date March"] How the assumptions combine: [describe the logic or PASTE existing formulas] Time horizon and granularity: [e.g. "12 months, monthly"] What I already know about best and worst cases: [ranges, past highs and lows - or "suggest them"] Build: 1. Inputs tab: every assumption in one place, one row each, with Base, Best, and Worst columns, units, and a source or rationale column. No numbers typed into formulas elsewhere. 2. Scenario switch: one dropdown cell (Data Validation list: Base, Best, Worst) and a "live" column using CHOOSE, INDEX/MATCH, or XLOOKUP to pull the selected values. 3. Calculation tab: the model logic referencing only the live column. 4. Results summary: key outputs for all three scenarios side by side, plus the difference from base. Keep it live with a one-variable Data Table (What-If Analysis) whose input cell is the scenario switch, so all three columns recalculate when an assumption changes; no macros or pasted values. 5. Consistency check: make sure each scenario is internally believable (e.g. high volume usually comes with higher costs, not just more revenue). 6. What would have to be true for the worst case to happen, and early warning signs to watch. Return the tab layouts, the formulas for the switch and key outputs, the scenario values table with your reasoning for any you suggested, and the checks. Mark suggested ranges as [CONFIRM] - I own the final assumptions.