In our Design for Scale lab, design question #3 asks us: “What’s our optimal fidelity for scale?”
What is fidelity? Very simply, it’s the degree of exactness with which something is copied and reproduced.
Why is it important?
Well, in some fields it’s both easy and critical that that the fidelity of an intervention is high. For example, when you’re sick and you take a pill you’re taking the same pill that others who share your diagnosis will take. The dose, timing and other instructions that you receive must be followed in order to get positive results.
Designing an intervention that should be replicated with high fidelity is both necessary and relatively straightforward for many fields. What about development? As we scale, we know that we can’t simply take our exact model and apply it to new geographies, new demographics and new sectors. We know that it won’t work if we don’t adapt.
Conversely, adapt too much or let the model be watered down and we may not be able to get them same positive impact we did in our pilot or the early stages of our programs.
David Butler, VP for Innovation at Coca-Cola, helps one of the world’s largest companies design for scale using a simple framework of determining what elements are “fixed” and which are “flexible.”

To break it down for us, he uses the analogy of lego bricks. The whole video is great, but for the part on legos start at the 8 minute, 30 second mark and end at 13 minutes, 50 seconds.