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![Cover for Ralph W. Tyler · Educational Evaluation: Classic Works of Ralph W. Tyler - Evaluation in Education and Human Services (Hardcover Book) [1989 edition] (1988)](https://imusic.b-cdn.net/images/item/original/730/9780898382730.jpg?ralph-w-tyler-1988-educational-evaluation-classic-works-of-ralph-w-tyler-evaluation-in-education-and-human-services-hardcover-book&class=scaled&v=1476286279)