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Accounting for the psychological processes that underlie the consulting strategies conceived as actions of assembling data, of selecting a corpus of television images into the collections of Inathèque de France, corpus to transform in order to proceed to analytical treatments (such as locating iconic and/or textual cues), that are supposed to be relevant to identify or to understand investigated phenomena. The session observations and reconstitutions give access to the cognitive difficulties in handling and adapting available tools and softwares. The metacognitive assessments that control the “acceptable closures” of corpus and the “typical representativeness” of the iconic and linguistic elements selected, are mentioned to explain how the researchers managed their work.