A learner who has already acquired a solution-method can not always use it adequately. Therefore, the practice to use a solution-method is indispensable to master it. A problem-solving practice is the most popular, but it is not the only way to make the learner master the solution-method. To make problems which can be solved by a solution-method is a promising way to master the solution-method. In this paper, we describe an Intelligent Learning Environment which realizes a problem-making practice. In the problem-making practice, the ILE provides a learner a solution-method and concepts. Then, by using the concepts, the learner makes problems that are solved by the solution-method. The ILE has a facility to diagnose the problem made by the learner. By using the result of the diagnosis, the ILE helps the learner to complete the problem, or provides the next problem-making exercise. The ILE is implemented with Java, so it can be used on World Wide Web. The current environment deals with arithmetical word problems and its solution-methods.
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