You might approach the three titles A Doll's House, A Street Car Named Desire and Long Days' Journey into Night from a thematic framework. For instance, O'Neill's work, Long Day's Journey into Night, delves into the search for self as a theme. Principally represented in Edmund's character, Edmund must choose a path to self-realization or follow the other characters into regret, escapism or spiritual oblivion.
In Willaims' A Street Car Named Desire, Blanche battles against the expectations of self-identity and the realities of self-expression. Her dilemma is related to Edmund's in that both have chaos and order to choose from on the quest for their path to self-realization.
In Ibsen's A Doll's House, Nora has established a path of self-realization for herself based on carefully chosen and guarded chaos and order. When Torvald discoveres her secret, his understanding of her identity is shattered and Nora is left to make a new choice regarding self-realization. This parallels the events following Mitch's discovery of Blanche's past.