Match each concept to the sociologist who introduced it.

• The sex and gender distinction in British sociology → Ann Oakley
• Doing gender as an interactional accomplishment → West and Zimmerman
• Gender as performative rather than expressive → Judith Butler
• The second shift of unpaid work after paid work → Arlie Hochschild

Read in sequence the four are a steady movement outward: from a property of persons, to something produced in interaction, to something constituted by repetition, to a measurable quantity of unpaid labour hours. Each move makes gender less a thing someone has and more a thing that is done, and each licenses a different kind of study.