We've all seen TDD and BDD but what about EDD? Experiment driven development is a way of assuring that changes you make to your application actually affect the bottom line of your business.

1. Experiment Driven Development
The “real” engineering in software
@mikegehard
BS Chemical Engineering
MS Software Engineering

2. How do you know that changes you
make to your web application are the
“right” ones?

3. What is “right”?

4. It depends.

5. What makes or saves my company
money?

6. Number of purchases
Number of new subscriptions

7. What is your theory about that
metric?

8. If you don’t know where you are
going, how do you know when you get
there?

9. By providing a larger skip link on the
signup page, we will increase the
number of purchases without
sacrificing new subscriptions.

10. A/B Testing while collecting data

11. Analyze the data without bias.

12. Leave the egos at the door.

13. When compared to the control, the
larger skip link increased purchases by
5% and did not decrease new
subscriptions.

14. Surprise?!?!?!?!?!

15. What’s next?

16. If you want to know why something
happened then propose a new
experiment to collect that data.

17. Repeat

18. Propose a theory about business
metric(s)
Experiment and measure those
metrics
Analyze the data and make a decision
Iterate and prosper

19. Thank you!
@mikegehard