In investigative learning with Web resources, learners are required to build a learning scenario, which explains what/how to investigate. However, it is difficult for them to build it concurrent with learning the resources. The main issue addressed in this paper is how to activate the learning scenario building in order to develop skill in investigative learning. This paper discusses a fadable scaffolding method for the skill development, in which parts of the learning scenario to be built are presented as a scaffold and are faded in accordance with their skill.