Handedness is a complex phenomenon influenced by many factors and manifests in different dimensions. A solid understanding of the various aspects of handedness is essential for comprehending the principles of its assessment and conducting it professionally. Only in this way can appropriate decisions be made for therapy and suitable interventions be derived for individuals with varying hand use. This book provides all the important information on handedness and introduces the Handedness Profile as a comprehensive diagnostic and assessment tool. With suggestions for conceptual structuring and systematization of handedness, it forms an excellent foundation for the therapy of individuals—especially children—with varying hand use. It is intended for occupational therapists, psychologists, special educators, and anyone working in this field.