What Is a Decision Model?
Learn how decision models organize alternatives, criteria, assumptions and consequences without pretending to remove judgment.
Decision Model Guide Library
Browse focused guides on financial models, uncertainty, tradeoffs, strategic choices and decision quality.
Foundations
A Practical Decision-Making Process
Follow a repeatable process to frame a choice, compare alternatives, test assumptions, decide and review the outcome.
How to Frame a Decision
Define the decision question, scope, time horizon, constraints, stakeholders and alternatives before building a model.
How to Choose Decision Criteria
Create criteria that are relevant, measurable, non-duplicative and aligned with the actual objective.
How to Choose the Right Decision Model
Match the structure of a decision to a weighted matrix, TCO, expected value, decision tree, scenarios or another framework.
Comparison Models
Weighted Decision Matrix
Build a weighted decision matrix, score options consistently and test whether small weight changes reverse the ranking.
Multi-Criteria Decision Analysis (MCDA)
Understand when MCDA adds value beyond a simple matrix and how it handles conflicting criteria and stakeholder preferences.
Financial Models
Total Cost of Ownership (TCO)
Estimate the full cost of acquiring, operating, supporting and retiring an asset or service over a common period.
Cost-Benefit Analysis
Compare total expected costs and benefits relative to a realistic baseline while accounting for timing and uncertainty.
Cost-Effectiveness Analysis
Compare the cost required to achieve a defined outcome when benefits cannot be credibly expressed in money.
ROI and Investment Return
Calculate simple ROI while recognizing the importance of timing, scale, risk and cash flow.
Payback Period
Calculate the time needed for cumulative cash inflows to recover an initial investment and understand what payback misses.
Break-Even Analysis
Calculate contribution margin, break-even units and revenue, then test price, cost and volume assumptions.
Risk and Uncertainty
Expected Value
Calculate probability-weighted outcomes and understand why expected value is not a guaranteed result.
Decision Tree Analysis
Map choices and uncertain events in sequence, then roll values backward to compare decision paths.
Scenario Analysis
Test how each option performs under coherent downside, base and upside futures.
Sensitivity Analysis
Identify the assumptions that drive a decision and find the values at which the preferred option changes.
Risk Registers and Decisions
Connect risks to options, controls, owners and decision thresholds instead of maintaining a separate ceremonial list.
Value of Information
Decide whether research, testing, a pilot or expert advice is worth its cost before commitment.
Economic Reasoning
Opportunity Cost
Include the value of the best forgone use of capital, time, capacity, space or attention.
Marginal Analysis
Compare the additional cost and benefit of one more unit, feature, period or level of service.
Tradeoffs
Tradeoff Analysis
Make cost, time, quality, flexibility and risk compromises explicit instead of searching for a universal best option.
Cost Versus Risk
Compare preventive cost, expected loss, resilience and catastrophic exposure without reducing every risk to an average.
Cost Versus Time
Evaluate schedule compression, delay cost and the point where spending more for speed no longer creates enough value.
Cost Versus Performance
Compare price with capacity, quality, speed, reliability and service using thresholds and diminishing returns.
Short-Term Versus Long-Term Decisions
Compare immediate savings with life-cycle cost, lock-in, flexibility and uncertainty over different horizons.
Strategic Choices
Lease Versus Own
Compare leasing and ownership using cash flow, total cost, utilization, flexibility, residual value and contract risk.
Buy Versus Build
Compare purchased solutions with internal development using fit, total cost, time, capability, control and exit risk.
CapEx Versus OpEx
Compare capital purchases and operating-service models using cash timing, total cost, flexibility and capacity risk.
Real Options and Staged Decisions
Use pilots, phases, deferral and expansion choices to preserve flexibility while uncertainty is resolved.
Decision Quality
Premortem Analysis
Assume a proposed decision has failed, identify plausible causes and convert them into controls and warning signs.
Decision Biases and Model Traps
Recognize confirmation bias, anchoring, sunk-cost effects, overconfidence and other distortions in models.
Group Decision-Making
Use group expertise while keeping dissent visible and preventing hierarchy or early voting from replacing analysis.
How to Write a Decision Record
Document context, alternatives, assumptions, rationale, risks, owners and review triggers in a concise record.
Data Quality in Decision Models
Assess source reliability, measurement consistency, missing data and uncertainty before trusting model outputs.
How to Validate a Decision Model
Check logic, formulas, units, assumptions, edge cases and practical usefulness before relying on a model.