This study compared a year-round intensive coaching of teachers (35h) with a restricted in-service course (13h), designed on the basis of research-based components of effective professional development of teachers. Both courses were developed to innovate reading comprehension instruction in elementary schools. Fourteen second- and 16 fifth-grade teachers participated. Results indicated that both conditions were equally effective in changing students' reading comprehension, reading fluency, reading strategy use, and self-efficacy perceptions. Teachers' experiences with the professional development course were also comparable in both conditions. A significant point of difference indicated; however, that teachers attending the restricted in-service course experienced more workload with regard to settling in the innovations.