Recent software systems contain a lot of functions to pro- vide various services. According to this tendency, software testing becomes more difficult than before and cost of test- ing increases so much, since many test items are required. In this paper, we propose and discuss such a new selective software testing method that is constructed from previous testing method by simplifying testing specification. We have presented, in the previous work, a selective test- ing method to perform highly efficient software testing. The selective testing method has introduced an idea of functional priority testing and generated test items according to their functional priorities. Important functions with high priori- ties are tested in detail, and functions with low priorities are tested less intensively. As a result, additional cost for gener- ating testing instructions becomes relatively high. In this pa- per, in order to reduce its cost, we change the way of giving information with respect to priorities. The new method gives the priority only rather than generating testing instructions to each test item, which makes the testing method quite sim- ple and results in cost reduction. Except for this change, the new method is essentially the same as the previous method. We applied this new method to actual development of soft- ware tool and evaluated its effectiveness. From the result of the application experiment, we confirmed that many crucial faults can be detected by using the proposed method.