You can vary the instructions, but make sure to keep them brief. The briefer, the better. You can have instructions like, “Cow,” “Find cow,” “Where’s the cow?” “Show me the cow,” or “Point to the cow.” Do NOT use any additional descriptors (e.g., “Point to the cow. It is black and white.”). Do NOT instruct the learner to say anything about the pictures (e.g., “Tell me where the cow is.” “What’s this one?”).