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A starter workbook for documenting the assumptions, dependencies and downside conditions around one material decision, then sketching upside, base, downside and severe-but-plausible cases, with the management responses each would demand.
A completed workbook produces a critical assumption register for the decision; starter upside, base, downside and stress scenarios; and preliminary failure conditions: the thresholds at which the decision fails or should trigger a review.
It also suggests leading indicators to watch, candidate management responses for each downside, and the questions the workbook's basic calculations cannot settle and formal modelling should. A business planning a second site might find, for example, that the case survives a demand shortfall but fails quickly on a modest cost overrun, making cost certainty the assumption to test first.
You define the base case, key assumptions, dependencies, upside, downside and severe-but-plausible conditions, a failure definition, leading indicators and management responses. Structured prompts and basic calculations turn those inputs into scenario sketches and thresholds.
The arithmetic is deliberately simple. The value is in forcing assumptions, dependencies and failure conditions to be written down and confronted, not in modelling precision. Where a question needs a validated model, the workbook says so rather than pretending to answer it.
Results are rule-based guidance generated from self-reported answers. They are directional, not accounting, legal or other professional advice, and a professional review working from evidence may reach different conclusions.
The workbook is saved against the decision you name, with scenario versions and review dates, so assumptions can be updated and decisions compared over time. Nothing you enter appears outside your Studio workspace.
Usage is measured at a category level (decision type, scenarios created, thresholds set and workbook completion) to improve the workbook and to route relevant recommendations inside Studio.
In Studio the workbook lives under Tools → Economics & Commercial Decisions → Scenarios, attached to a named decision, forecast, investment, pricing change or recovery plan. It can reuse assumptions already entered in the Unit Economics Calculator, Forecast Readiness Worksheet, Scale & Capacity or Technology Investment tools, so the same numbers aren't typed twice.
Scenario versions are saved with review dates, so you can update assumptions as conditions change and compare how decisions were framed over time. A future monitoring feature is planned to surface alerts when an indicator you entered crosses one of your thresholds. Until then, the review dates are the prompt.
When the result points at a constraint that needs professional depth, these engagements pick it up.
Registration is free, no card required, and your results save to your workspace so the working stays in one place.