The following book will provide an excellent introduction to the subject of library assessment, preparing you to design and implement continuous service reviews.
Matthews, Joseph R.The Evaluation and Measurement of Library Services. Westport, CT: Libraries Unlimited, 2007. [Print]. An excellent introduction to evaluation and measurement of library services, containing summaries of prior research and bibliographies, overviews of techniques, and areas for exploration.
The following books and articles provide various philosophical overviews to the concepts of organizational cultures, qualitative and quantitative library assessment, analysis methods, and practical implementation strategies.