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The major planning theories provide a theoretical foundation for environmental planning. This study extends the major planning theories and develops a robust conceptual framework to measure the key factors influencing local environmental-plan quality. A random sample of forty Californian local comprehensive land-use plans and associated planning processes is analyzed to identify the critical factors influencing environmental-plan quality. Results from multiple regression analysis indicate that regular updating, environmental-information management and sharing, and planners contribute significantly to local environmental-plan quality. The findings expand established planning theories and practice by suggesting ways to improve local environmental-plan quality.