All I Really Need to Know I Learned in Kindergarten   We built a playground-type set ... with a sliding board and a swing.   Jon Blackstock, Wildcat Players!, Tiger, Ga.   Keep set and costumes absolutely simple. The content of the show will sell itself. Focus on the acting and storytelling skills of the performers.   Melinda Heger, North Decatur Junior/Senior High School, Greensburg, Ind.   I cast 15 in this show, which allowed each actor to hone their parts. I built a 15' X 8' wedge to use as our trap door for both "Howard" and "Stuff." We used it for actors' entrances and exits as well!   Jo Husslein, Hartford Players, Inc., Hartford, Wis.   Do use sound effects and music. It helps a lot for the audience to get the special messages.   Arlene Millerman, Shortgrass Playhouse, Hobart, Okla.   I had to read it twice before grasping how much creativity was allowed.   Bonnie Perry, Schoolhouse Players, Bartow, Ga.   Our lobby display featured pictures of our cast when they were in kindergarten.   Kate Lindsay, Salina High School South, Salina Kansas