A manager asked several employees to cut a 30 cm piece of paper from the wrinkled paper tape, which can only be visually inspected, not measured. Then, each listener was asked to cut 150 cm and 600 cm long. Each piece of paper tape. After everyone cuts, the manager takes out a tape measure, carefully measures each piece of paper and announces the results: a set of 30 cm, the average error is less than 6%, and the average error of the 150 cm set rises to 11% 600 cm group, the average error is as high as 19%, and the individual difference is 100 cm. This leads to:. ['The smaller the target, the more concentrated it is, and the easier it is to approach the target.', 'The larger the goal, the broader it is, and the less likely it is to deviate from it.', 'The target size is moderate, and it is easiest to approach the set goal.', 'Target size has nothing to do with how close it is.']