Variant Groups & Scenario Planning

Variant groups allow you to model design alternatives, assign probability weights, and compare scenarios.

Creating Variant Groups

1. Navigate to your project in the DataGrid
2. Click Variants in the toolbar
3. Click New Variant Group
4. Name the group and add a description

Adding Variants

Each variant group can contain multiple design alternatives:

1. Open a variant group
2. Click Add Variant
3. Enter a name (e.g., "Option A — Steel Structure", "Option B — Concrete")
4. Assign a probability weight (0-100%)
5. Link relevant BIM elements to each variant

Probability Weighting

Assign probability weights to variants to enable weighted cost forecasts:

• Weights within a group should sum to 100%
• The system calculates expected cost as the weighted average across variants
• Useful for early-stage decision making when multiple options remain viable

Risk Management

Each variant can have associated risk cards:

• Risk description: What could go wrong
• Impact assessment: Cost and schedule impact
• Mitigation: Planned mitigation strategies
• Status: Open, mitigated, accepted

Comparison Views

Compare variants side-by-side:

• Cost comparison: Total cost per variant with probability weighting
• Property differences: Which elements differ between variants
• Risk summary: Aggregated risk per variant

Decision Audit Trail

All variant group decisions are logged with:

• Who made the decision
• When it was made
• Which variant was selected
• Justification notes