Striking scriptwriters have filed charges of unfair labor practices against 13 production companies but have scheduled another meeting with producers in an effort to end their 4-month-old walkout.

The charges were filed with the National Labor Relations Board on Wednesday, said Writers Guild of America spokeswoman Cheryl Rhoden. They accuse the companies of bargaining in bad faith by refusing to provide information on writers as requested by the guild last month, Rhoden said.