Summarizing is restating the most important ideas from an original text briefly. Students often need summary writing skill along the education life since it provides understanding and remembering the reading material. This study aims to apply book summary writing strategy which is based on in-class implementations, and to develop the students book summary writing skill with education. With this aim, to determine students' book summary writing skill and analyze the development of their book summary writing skill, researchers have developed a book summary writing strategy and also a rubric to evaluate the written summaries. While developing the book summary writing strategy, researchers have conducted the study with 44 university students studying at Turkish language teaching department in the third grade. The study lasted for 11 weeks, and the education period is implemented as one week education and one week summary writing implementation. The strategy and rubric have been updated with the students' views, feedbacks and researchers' notes during the education process. In the study, of the qualitative research methods, grounded theory was used. At the end of the study, it is stated that students have been successful in writing a book summary, tagging and taking notes, isolating from trivial details and also, they could write the summaries in a shorter time. The study findings revealed the usable book summary writing strategy and the rubric for book summary evaluation.