Handedness is a multidimensional phenomenon co-determined by polygenetic and developmental aspects, multifactorial influences and pathological impact. It is important for professionals working with children, particularly if still undecided about their writing hand, to assess, analyse and understand the complexity of handedness in a comprehensive and coherent way to prevent problems related to switched or atypical handedness.Beyond Left and Right Handednessuses a practice-based approach to handedness and systematically integrates theory, research and practice. Part I, ‘Theory and...