Your textbook spends a considerable amount of time helping us understand how to use the CAST technique as an accident investigation analysis tool while focusing on the why rather than the how and what aspects of the accident or incident.
1) Why do you think that Leveson considers it so important to focus on the why aspect of an accident or incident?
2) How does this focus on why rather than how and what align with your current accident investigation process (either as an employee or safety manager)?
TEXTBOOK- https://mitpress.mit.edu/sites/default/files/titles/free_download/9780262016629_Engineering_a_Safer_World.pdf