Dr. Diana Wehrell-Grabowski science education consultant provides 67 photos and a brief narrative describing what reflective journaling is and how it can be used in the STEM and science classroom to develop and strengthen critical thinking skills. The reflective journal is very different than the traditional student notebook. Your students will practice empirical observations and thought processes as Leonardo da Vinci did. Reflective journaling is student-created, it engages the student in the learning process. Reflective journals can be used as formative assessments. Additionally, they can be peer-reviewed, and encourage collaboration among students. Collaboration in the science, technology, engineering, and math classroom is crucial. The most powerful component of reflective journaling is that it allows the student to take ownership of their learning. For more information about the STEM and science teacher training workshops, Dr. Diana Wehrell-Grabowski conducts nation and worldwide check out her site at: http:/www.dianawehrellgrabowski.com