Book excerpt: Improvisation informs a vast array of human activity, from creative practices in art, dance, music, and literature to everyday conversation and the relationships to natural and built environments that surround and sustain us. The two volumes of the Oxford Handbook of Critical Improvisation Studies gather scholarship on improvisation from an immense range of perspectives, with contributions from more than sixty scholars working in architecture, anthropology, art history, computer science, cognitive science, cultural studies, dance, economics, education, ethnomusicology, film, gender studies, history, linguistics, literary theory, musicology, neuroscience, new media, organizational science, performance studies, philosophy, popular music studies, psychology, science and technology studies, sociology, and sound art, among others.