Final answer:
The technique Coach Perry is using to train Lana as a goalie is called shaping, which involves rewarding progressively closer approximations to a desired behavior.
Step-by-step explanation:
Coach Perry is using a technique called shaping to train Lana to be the soccer team's goalie. This technique involves reinforcing successive approximations of a target behavior until the desired behavior is achieved. By slowly increasing the difficulty of the task, starting with rolling the ball slowly and then faster to different parts of the goal, and praising Lana's successful attempts, Coach Perry is breaking down the skill into manageable steps and rewarding Lana's progress toward the final goal of becoming a proficient goalie.