Students face daily academic challenges when trying to learn new content in school, and these challenges can make it increasingly difficult for students to continue to work when frustrated. Students who put forth extended effort into their learning are said to have a growth mindset. Teachers heavily influence students by the way they present information and the language they commonly use within the classroom. The problem addressed in this study was that teachers may not have the needed training and resources to help elementary students develop a growth mindset to build motivation and positivity in themselves and their learning. The researcher explored the perspectives of four teachers in grades 3 through 5 on how the information presented in professional development training on growth mindset was incorporated into their teaching practice. The purpose of this qualitative single case study was to understand how professional development training for teachers may help elementary students to develop a growth mindset to build motivation and positivity. The researcher analyzed data to see if there were any similarities in the training outcomes gathered from participant perspectives about changes in student engagement, motivation, and achievement that could be attributed to developing growth mindsets. Two themes -- differentiated instruction tactics and encouragement leading to change --emerged from the interviews, surveys, and observations. Implications include that teachers can take knowledge of the growth mindset strategy and apply differentiated instruction tactics with students, allowing students to process the information and show their level of knowledge. Recommendations for practice include school leaders allowing for professional development training that teachers can implement in their own classrooms and follow-up training later in the year. Future research should focus on quantitative measures rather than qualitative ones, use a larger pool of participants, and utilize the training at the middle school level. [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.]