This book illustrates the problems of using eye tracking technology and other bio-measurements in science education research. It examines the application of bio-measurements in researching cognitive processes, motivation for learning science concepts, and solving science problems. Most chapters of this book use the eye-tracking method, which enables following the focus of the students' attention and drawing conclusions about the strategies they used to solve the problem. This book consists of a total of fifteen chapters. Authors from eight countries emphasise the same trends despite their cultural and educational differences. The book begins with general chapters describing cognitive processes and how these processes are measured using eye-tracking methods and other psychophysiology parameters and motivation. Finally, the book concludes the chapters presenting studies in specific scientific fields from chemistry, biology, physics and geology.