Scrum.org
Christina is a cofounder of Scrum.org. She was a member of the first scrum teams, before the company knew they were doing Scrum. Her expertise is quality assurance and testing. She taught Ken the importance of test-driven development and the definition of done. She also helped write and edit Ken's books and develop and teach classes.
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Scrum.org
Scrum.org, the Home of Scrum, was founded by Scrum co-creator Ken Schwaber as a mission-based organization to help people and teams solve complex problems. They do this by enabling people to apply Professional Scrum through training courses, certifications and ongoing learning all based on a common competency model.