Before & After Comparison

What is Before & After Comparison?

A Before & After Comparison is a structured measurement tool that places baseline metrics (from Step 1) side by side with post-implementation results. It answers the fundamental question: "Did the improvement work?" The comparison uses the same metrics, measurement methods, and time periods defined at the start of the project to ensure an honest evaluation.

When to Use It

• •In Step 6 (Evaluate) after the implementation is complete and has had time to stabilize
• •When presenting results to leadership and stakeholders
• •When deciding whether to standardize the solution or iterate with another cycle

How to Use It: Step by Step

1. 1

   Retrieve baseline data

   Pull the metrics recorded in Step 1: As-Is values, targets, and measurement definitions.

2. 2

   Collect post-implementation data

   Measure the same metrics using the same method. Ensure enough time has passed for results to stabilize (typically 2-4 weeks post-implementation).

3. 3

   Calculate improvement

   For each metric, compute the change: absolute difference, percentage improvement, and whether the target was met.

4. 4

   Document and present

   Create a comparison table: Metric, Baseline, Target, Actual, % Change, Target Met (Y/N). Include commentary on why targets were or were not met.

Pro Tips

• ✓Never change the metrics after the project starts — moving goalposts destroys credibility
• ✓Measure over a consistent time period: if the baseline was a 4-week average, the "after" should be too
• ✓Present both absolute and relative improvements — "$120K saved" and "42% reduction" tell different stories
• ✓If results exceed the target, document why — it may reveal best practices worth replicating

Facilitation Guide

Hold a 90-minute evaluation workshop. Present before/after data and let the team review silently (10 min). Discuss results as a group — were targets met? Why or why not? (20 min). Run a structured retrospective: each person writes what went well, what to improve, and action items on separate sticky notes (15 min). Share and cluster the notes (20 min). Draft the evaluation summary together — key findings, recommendations, and next steps (15 min). Decide as a team: standardize the solution, iterate with another cycle, or close the project (10 min).

Other Tools in Step 6