In relation to Ibsen's play, conformity (and the choice not to conform) plays a major role in the outcome of the narrative and in the ultimate themes of the work.
The strictures, perceptions and stereotypes that define Nora's role through the play are painfully clear and painfully restrictive on Nora's development as an individual. Though some happiness is available to her through her children, very little esteem and respect are offered to her in the role that she fills as a house-wife.
Nora has abilities. She has a mind of her own and a will toward independence, yet she is hemmed in by a stereotype. In the end, this restrictive stereotype becomes the center of Nora's conflict and she rebels. Where she had conformed to an image of a meek and volitionless woman in order to maintain her relationship with her husband, she decides ultimately to cast off her conformity.
Even while she was outwardly conforming, however, Nora was secretly undermining this role as she carried on an surreptitious loan arrangement with Krogstad. Considering this secret loan, an argument can be made that Nora is engaged in a rebellion against simple and meek conformity from the story's outset.