All models are wrong, some are useful

I’ve heard this quote a lot over the years, and it’s one they really resonates with me.Tornado Chart

Modelling & forecasting is a process of educated guesswork based on both historical information & professional experience. Reality rarely aligns perfectly with forecasts due to factors beyond our control. Consider these real-life examples:

  • Weather Impacts: for businesses selling camping goods, just 2 days of rain on critical sale days could have a big impact on sales.
  • Shipping Delays: Delays of only a few days can drastically reduce bank balances due to the mismatch between creditor payments and incoming sales revenue
  • Unscheduled manufacturing shutdowns: Sudden operational halts can disrupt production timelines and revenue streams.
  • Low EBITDA-Margin Sensitivity: Incremental revenue changes in low EBITDA-margin businesses can disproportionately impact the bottom line.

Benefits of Scenario Analysis

Scenario analysis is a powerful tool in financial modelling, enabling businesses and analysts to manage uncertainty by exploring various possible outcomes. Key benefits include:

  • Risk Assessment: It helps identify potential risks and their impact on financial outcomes. By modelling best-case, worst-case, and base-case scenarios, you can better understand uncertainties.
  • Decision-Making: Scenario analysis supports better decision-making by showing how financial metrics (like revenue, profit, or cash flow) might respond to changes in external factors, such as market conditions or regulatory changes.
  • Strategic Planning: It provides insights that allow organizations to prepare contingency plans, allocate resources effectively, and adapt to unforeseen circumstances.
  • Investor Confidence: Demonstrating scenario analysis in models builds trust with investors or stakeholders by showing a business’s preparedness for various possibilities.
  • Stress Testing: It allows businesses to “stress test” their financial models under extreme or unlikely scenarios, ensuring resilience.

Common Pitfalls to Avoid

Despite its advantages, scenario analysis can go awry if not executed properly. Watch out for these mistakes:

1. Overlooking Key Variables:
Focusing on too few variables or neglecting critical factors that could impact outcomes leads to incomplete scenarios.

2. Unrealistic Assumptions:
Using assumptions that are overly optimistic or pessimistic can skew results and reduce the credibility of your analysis.

3. Ignoring Interdependencies:
Treating variables as independent when they are actually interlinked can distort outcomes. For example, a market downturn might affect both sales and costs simultaneously.

4. Limited Scenarios:
Considering only “best-case” and “worst-case” scenarios without exploring a broader range of possibilities misses important insights into medium-probability outcomes.

5. Failing to Update Analysis:
Using outdated information or assumptions doesn’t reflect current realities and can lead to poor decision-making.

6. Excessive Complexity:
While depth is good, overcomplicating the model can make it difficult for stakeholders to understand and trust the results.

7. Neglecting Sensitivity Analysis:
Without assessing how sensitive the model is to changes in individual variables, you might overlook which factors have the most significant impact.

Scenario Analysis Amid Uncertain Policy Landscapes

With the upcoming federal election, there is uncertainty of the policies which will ultimately be legislated and their effect on the business landscape. There are already different policies announced across a variety of sectors:

  • Retail: Tariff adjustments may affect pricing and supply chains.
  • Energy: Policies could influence the transition toward renewable resources.
  • Healthcare: Changes in regulations could impact service delivery and costs.
  • Real Estate: Economic and regulatory shifts could alter market valuations and investments.

It is vital for businesses operating in these sectors to stress test forecasts to understand the potential effects on future profitability, cash reserves and debt covenant.

The Takeaway

Scenario analysis is adaptable and valuable in virtually any industry where strategic planning and decision-making are critical. By incorporating it into financial models, organisations can create dynamic and actionable plans that account for uncertainties and foster resilience.


Are you curious about analysing the impacts of scenarios to a project? Let us know!