The Artistic Directors of four off-Broadway not-for-profit theatre companies -- Douglas Aibel of Vineyard Theatre, Charlotte Moore of Irish Repertory Theatre, Tim Sanford of Playwrights Horizons and Jim Simpson of The Flea Theater -- share their thoughts about attracting audiences to their shows, the cost of keeping their theaters going, the challenges they face competing with commercial productions, how they choose the works performed on their stages and what they hope to accomplish for their companies in the next several years.