I think that one of Mary Warren's most dominant interests is the need to be accepted. Mary yearns for this and is not very good being marginalized or being on her own. To a great extent, Abigail and the other girls know this and use it on her during the trial in Act III. The entire "vision" element and the mocking her during the trial is to get her to capitulate to recant everything, indicating her need for the group. Mary also shows this interest in Act II when she divulges her role on the "jury" inquest into the presence of witches in Salem. Mary is shown to be a character who needs public acceptance, yearning for it. This becomes a noticeable interest in her composition. I think that this is where her most dominant interest is evident, in the need to be accepted. Even in her testimony for Proctor, it is done so to the extent that she will be accepted by him. Mary Warren is shown to be someone who absolutely needs public acceptance and the company of the conformist crowd. She is not one who is at her best in being on her own, making public acceptance a definite interest and part of her character.