Dear Professor Mohamed,
I am sending you this mail to thank you a lot for teaching us such a great and valuable course, Design of experiments. Regardless any grades, I have learned a lot from you in this course and the previous three courses that I felt so lucky that you taught me, Operations research, Quality control, and Design for manufacturing. I intend to use design of experiments and operations research in my thesis, so I felt that it is a tribute to thank you for teaching me the useful knowledge that will help me in my career. I was honored to learn from you and hope you teach me again.
Best Regards,
Omar Al-Assal