This document introduces the Improvement Kata, a four-step scientific practice pattern for continuous learning and improvement. The four steps are: 1) Describe an overall challenge to strive for; 2) Study the current condition and understand where you are now; 3) Describe a measurable next target condition to reach within 1-3 months; and 4) Iterate daily experiments using the PDCA cycle to find the path toward the target condition. The kata pattern is meant to make continuous learning and experimentation toward challenges a habit.