The reasons why the learner, either a child or an adult, needs "teaching inputs" are very often hidden as a corollary of the emphasis on—and possibly the misunderstanding of—the constructivist principles of design of learning environments. I would like to suggest here that these needs are especially important in the case of modern environments which are largely distributed and provide a potential access to a huge amount of knowledge and information. The following questions illustrate some of the issues that learners may have to face when left on their own in the wild web of digital resources: "How to look for something you don't know? ", "How to know that what you have found is what you were looking for? ", "How to know that you have learned?". Here are some of the issues that a teaching assistant should help to address. Another crucial question is: "How will others know that you know?"
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