Demand Forecasting Framework

Build accurate demand forecasts using multiple methodologies. Combines statistical models with market intelligence for actionable predictions.

When to Use

Quarterly/annual demand planning
New product launch forecasting
Inventory optimization
Capacity planning decisions
Budget cycle preparation

Forecasting Methodologies

1. Time Series Analysis

Best for: Established products with 24+ months of history.

Decompose into: Trend + Seasonality + Cyclical + Residual

Moving Average (3-month):
  Forecast = (Month_n + Month_n-1 + Month_n-2) / 3

Weighted Moving Average:
  Forecast = (0.5 × Month_n) + (0.3 × Month_n-1) + (0.2 × Month_n-2)

Exponential Smoothing (α = 0.3):
  Forecast_t+1 = α × Actual_t + (1-α) × Forecast_t

2. Causal / Regression Models

Best for: Products where external factors drive demand.

Key drivers to model:

Price elasticity: % demand change per 1% price change
Marketing spend: Lag effect (typically 2-6 weeks)
Seasonality index: Monthly coefficient vs annual average
Economic indicators: GDP growth, consumer confidence, industry PMI
Competitor actions: New entrants, price changes, promotions

Demand = β₀ + β₁(Price) + β₂(Marketing) + β₃(Season) + β₄(Economic) + ε

3. Judgmental / Qualitative

Best for: New products, market disruptions, limited data.

Methods:

Delphi method: 3+ expert rounds, anonymous, converging estimates
Sales force composite: Bottom-up from territory reps (apply 15-20% optimism correction)
Market research: Survey-based purchase intent (apply 30-40% intent-to-purchase conversion)
Analogous forecasting: Map to similar product launch curves

4. Blended Forecast (Recommended)

Combine methods using confidence-weighted average:

| Method | Weight (Mature Product) | Weight (New Product) | |--------|------------------------|---------------------| | Time Series | 50% | 10% | | Causal | 30% | 20% | | Judgmental | 20% | 70% |

Forecast Accuracy Metrics

| Metric | Formula | Target | |--------|---------|--------| | MAPE | Avg(|Actual - Forecast| / Actual) × 100 | <15% | | Bias | Σ(Forecast - Actual) / n | Near 0 | | Tracking Signal | Cumulative Error / MAD | -4 to +4 | | Weighted MAPE | Revenue-weighted MAPE | <10% for top SKUs |

Demand Planning Process

Monthly Cycle

Week 1: Statistical forecast generation (auto-run models)
Week 2: Market intelligence overlay (sales input, competitor intel)
Week 3: Consensus meeting — align Sales, Marketing, Ops, Finance
Week 4: Finalize, communicate to supply chain, track vs prior forecast

Demand Segmentation (ABC-XYZ)

| Segment | Volume | Variability | Approach | |---------|--------|-------------|----------| | AX | High | Low | Auto-replenish, tight safety stock | | AY | High | Medium | Statistical + review quarterly | | AZ | High | High | Collaborative planning, buffer stock | | BX | Medium | Low | Statistical, periodic review | | BY | Medium | Medium | Hybrid model | | BZ | Medium | High | Judgmental + safety stock | | CX | Low | Low | Min/max rules | | CY | Low | Medium | Periodic review | | CZ | Low | High | Make-to-order where possible |

Safety Stock Calculation

Safety Stock = Z × σ_demand × √(Lead Time)

Where:
  Z = Service level factor (95% = 1.65, 98% = 2.05, 99% = 2.33)
  σ_demand = Standard deviation of demand
  Lead Time = In same units as demand period

Scenario Planning

For each forecast, generate three scenarios:

| Scenario | Probability | Assumptions | |----------|-------------|-------------| | Bear | 20% | -15% to -25% vs base. Recession, market contraction, competitor disruption | | Base | 60% | Historical trends + known pipeline. Most likely outcome | | Bull | 20% | +15% to +25% vs base. Market expansion, product virality, competitor exit |

Red Flags in Your Forecast

[ ] MAPE consistently >20% — model needs retraining
[ ] Persistent positive bias — sales team sandbagging
[ ] Persistent negative bias — over-optimism, check incentive structure
[ ] Tracking signal outside ±4 — systematic error, investigate root cause
[ ] Forecast never changes — "spreadsheet copy-paste" problem
[ ] No external inputs — pure statistical = blind to market shifts

Industry Benchmarks

| Industry | Typical MAPE | Forecast Horizon | Key Driver | |----------|-------------|-----------------|------------| | CPG/FMCG | 20-30% | 3-6 months | Promotions, seasonality | | Retail | 15-25% | 1-3 months | Trends, weather, events | | Manufacturing | 10-20% | 6-12 months | Orders, lead times | | SaaS | 10-15% | 12 months | Pipeline, churn, expansion | | Healthcare | 15-25% | 3-6 months | Regulation, demographics | | Construction | 20-35% | 12-24 months | Permits, economic cycle |

ROI of Better Forecasting

For a company doing $10M revenue:

5% MAPE improvement → $200K-$500K inventory savings
Reduced stockouts → 2-5% revenue recovery ($200K-$500K)
Lower expediting costs → $50K-$150K savings
Better capacity utilization → 3-8% OpEx reduction

Total impact: $450K-$1.15M annually from a 5-point MAPE improvement.

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