The idea that video games have a detrimental effect on children who play them is widely contested. Though providing excellent coverage of these effects, Kooijmans' "Effects of Video Games on Aggressive Thoughts and Behaviors During Development" leaves out many of the positive aspects of video games. The paper does mention their use for therapy, hand-eye coordination training, and simulations, but it does not cover any actual developmental effects. Video games teach many skills to the developing child. Examples of these skills include problem-solving abilities, perseverence, pattern recognition, hypothesis testing, estimating skills, inductive reasoning, resource management, logistics, mapping, memory, quick thinking, and reasoned judgments (Sheff, 1994). Many of these skills are abstract and require higher-level thinking, which schools do not often teach children. By including a way to choose one's own level of difficulty in most, if not all, video games, one can tailor the degree of intricacy of the tasks in the game to meet one's own skills. After the tasks are completed at an easy level, a child will feel motivated to attempt a higher degree of difficulty. By slowly ramping up the difficulty, the child is able to accomplish goals and learn while increasing his or her self-efficacy.