I just did this project with my 3rd and 4th grade theatre classes last six weeks and the kids loved it! During our unit on Greek theatre, we read and performed some of Aesop's Fables. Then I assigned the kids to groups of 4 or 5 and went through this packet with them - by the end of it, they had all written their own short plays!
This packet includes 11 pages of step-by-step directions for writing a short play, as well as rough draft and final draft script pages. This project is a great tool for introducing basic elements of story-telling (such as plot, moral/theme, dialogue, setting, etc.) and promote self-confidence through creative writing and oral reading.
This project took two weeks to complete in my class. The kids all took part in the writing process and in the performance process and loved it!