List Reduction

What is List Reduction?

List Reduction is a structured technique for narrowing a long list of options (typically from a brainstorming session) to a manageable shortlist. It applies pass/fail criteria to eliminate options that clearly do not meet basic requirements, without getting into detailed scoring. The result is a focused shortlist ready for deeper evaluation with tools like the Criteria Matrix.

When to Use It

• •After brainstorming produces 20+ ideas and weighted voting alone is not sufficient
• •When the team needs to eliminate options that are infeasible before investing time in evaluation
• •As a first filter before applying the criteria matrix

How to Use It: Step by Step

1. 1

   Define must-have criteria

   Set 3-5 pass/fail filters: Is it within budget? Can it be implemented within the timeline? Does it address the root cause? Is it within our control?

2. 2

   Screen each option

   For each idea, check it against every must-have criterion. If it fails any one, it is eliminated.

3. 3

   Review the survivors

   The remaining options are the shortlist. Confirm the team agrees that no important idea was lost.

4. 4

   Move to detailed evaluation

   The shortlist (typically 3-8 options) goes into the criteria matrix or paired comparisons for final selection.

Pro Tips

• ✓Keep must-have criteria binary (pass/fail) — do not introduce scoring at this stage
• ✓If the list reduces to fewer than 3, your criteria may be too strict — revisit them
• ✓Save the eliminated ideas — they may become relevant in a future cycle with different constraints

Facilitation Guide

Gather the team for a 60-minute session. Start with each person silently writing what they believe the problem is (5 min). Share and cluster similar statements (15 min). Draft a unified As-Is / Desired State / Gap statement together (20 min). Quantify the impact with available data (15 min). Close by confirming team agreement on the statement (5 min).

Other Tools in Step 1