Previous to this study, teaching and learning practices in the first-grade classroom of study were primarily teacher and content driven and did not reflect the student-driven inquiry process. The identified problem of practice for this action research study was the first-grade students in the teacher-researcher classroom did not demonstrate inquiry or scientific literacy through content-centered teaching practices. The research plan presented addressed the use of scientific practices as they related to inquiry-based teaching and learning. An action research methodology was used to explore the instructional tools that increased student proficiency in two specific scientific practices: analyzing and interpreting data and generating arguments from evidence. The impact of a focus on scientific practice on the inquiry-based teaching and learning practices within a first-grade International Baccalaureate Primary Years Programme School were also investigated. This study was conducted over a six-week period in Spring 2018. [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://bibliotheek.ehb.be:2222/en-US/products/dissertations/individuals.shtml.]