If you've been planning to develop your plays and musicals using professional actors in a “developmental” production environment, you may have to put your plans on hold.

Earlier this week, the union declared a strike against members of the Broadway League (the association that represents producers) on development of Broadway shows. The Union's action bars its members from taking part in the so-called. “lab” sessions that have become popular as a way for writers to enlist performers aid in developing new shows. These labs are similar to Workshops and Stage Readings, which are also covered by the Strike.