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
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

1. Week 1: Statistical forecast generation (auto-run models)
2. Week 2: Market intelligence overlay (sales input, competitor intel)
3. Week 3: Consensus meeting — align Sales, Marketing, Ops, Finance
4. 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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