Effectiveness of web-based modules developed for a course in numerical methods was measured via three mixed assessment instruments - student satisfaction survey, student performance on a multiple-choice examination based on Bloom's taxonomy, and summative rating of the modules based on content, learning, usability and technology. The web-based modules are holistic and are customized based on a student's engineering major and choice of computational system. Statistical analysis of the assessment data indicates that web-based modules improved both student satisfaction and performance.