Wittgensteinian positions that work through social and psychological theories in combination with conceptual or grammatical investigations are outlined in Chap.  3. Illustrating Wittgensteinian influence on and relevance to an interdisciplinary psychology begins with a focus collective phenomena including differences between collectives and contemporary research on collective emotions. The importance of surroundings and context for social psychology are detailed through exploration of creativity, madness, meaning and rule-breaking. The details and significance of the so-called Private Language Argument are highlighted in a section on cognitive and individual phenomena, including examples of theoretical and empirical work on memory and emotions. The last section examines Wittgenstein's impact on developmental psychology to critique theory of mind approaches and explore complex and atypical late and early developing skills, abilities and experiences.