This study investigated whether a teacher professional development module built around designing WebQuests could improve teachers' technological and pedagogical skills. The technological skills examined included Web searching and Web evaluating skills. The pedagogical skills targeted were developing a working definition for higher-order thinking skills, and designing WebQuest tasks to improve such skills. This case study was carried out with six inservice teachers. After the training, all the teachers showed improvement in their Web searching and evaluating skills. Furthermore, teachers adopted a working definition for higher-order thinking skills, and, using Web resources, they designed activities that promote students' higher-order thinking. This study provides evidence supporting the use of design-based activities in learning technological and pedagogical skills and suggests an effective inservice teacher professional development module.