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pivotal recherche utilisateur user research ux design thinking lean collaboration user experience pairdesign pairprogramming ownership pivotallabs cocreation product design product development roadmap product management redesign relaunch styleguide webmontag webmonday dawanda atelier workshop consulting design centr茅 utilisateur post-its entretiens interviews experiements agile user-centered-design super powers problems and insights affinity map experiments ucd user interviews jtbd research stakeholders