This book develops an original Heideggerian account of the timespace and indeterminacy of human activity while describing insights that this account provides into the nature of activity, society and history. Drawing on empirical examples, the book argues that activity timespace is a key component of social space and time, shows that interwoven timespaces form an essential infrastructure of social phenomena, offers a novel account of the existence of the past in the present, and defends the teleological character of emotional and ceremonial actions.