Jоhn, Mаleek, аnd Chаrlоtte are playing in the dramatic play area. Jоhn says, "I'm going to be the doctor." Maleek says, "I'm going to be the nurse so Charlotte you have to be the patient." Charlotte says, "Okay" and starts telling the doctor that her stomach hurts. John takes the toy stethoscope and listens to her heart while Maleek writes things down on paper. This is an example of: