First grade teachers play a critical role in shaping the foundation for early literacy skills acquisition of primary students. Past research studies have indicated that primary students whose teachers followed the"Big 5 Ideas" to teach reading had higher reading abilities when compared to other students. The purpose of this current research was to address a gap in the literature by examining first grade teachers' perceptions of the "Big 5 Ideas," their levels of knowledge of the literacy concepts, the frequency with which these teachers use their knowledge of the "Big 5 Ideas", and the possible influence of the use of the "Big 5 Ideas" on their routine reading instructional practices. A mixed methodology of cross-sectional and observational design was used in this research, which consisted of two phases. Phase One was conducted using a developed questionnaire that was composed of necessary components of the "Big 5 Ideas" in reading instruction to be completed by the 780 selected first grade teachers. Quantitative data were collected through an established online survey company (Qualtrics) and analyzed using descriptive statistics, one-way multivariate analysis of variance (MANOVA), and one-way analysis of variance (ANOVA). Phase Two was completed using a developed observational checklist and visual analysis (i.e., five research assistants observed and collected qualitative data from five selected first grade classrooms). The findings related to Phase One of this research indicated: (a) universal agreement on the importance of implementing the "Big 5 Ideas" in daily reading instruction, (b) relatively adequate levels of knowledge of the "Big 5 Ideas" of all first grade teachers, (c) relatively high percentage of implementation of the "Big 5 Ideas" during daily reading instruction, (d) no statistically significant differences between first grade teachers' perceptions of the "Big 5 Ideas" and their degree types, number of years teaching, or types of licensure, (e) statistically significant differences in first grade teachers' implementation of the "Big 5 Ideas" based on the number of literacy courses taken during teacher preparation programs for phonics, vocabulary, and fluency, and (f) no statistically significant differences in first grade teachers' implementation of the "Big 5 Ideas" based on the number of literacy courses taken during teacher preparation programs for phonemic awareness and comprehension. The findings related to Phase Two of this research revealed that there were strong relationships between the observed first grade teachers' (e.g., teacher one and teacher five) perceptions of the "Big 5 Ideas" and their actual implementation of the "Big 5 Ideas." Conversely, there were weak relationships between these teachers' (e.g., teacher two, teacher three, and teacher four) perceptions of the above five strands of effective reading instruction and their daily observed reading instructional practices. [The dissertation citations contained here are published with the permission of ProQuest LLC. Further reproduction is prohibited without permission. Copies of dissertations may be obtained by Telephone (800) 1-800-521-0600. Web page: http://www.proquest.com/en-US/products/dissertations/individuals.shtml.]