Video registration with multiple brain crackers. – “Interaction Design stresses human-centeredness. A strong focus on people is essential, but we also must focus on craft materials, their form and their function. While some design practices focus too much on means (the ‘what’ of design), avoiding commitments to explicit ends (the ‘why’), we cannot ignore design means. Also, we must further distinguish the purpose of design (‘why’) from its beneficiaries (‘who’), and also between both of these and the ‘if’ of designing, i.e., between evaluation, purpose and beneficiaries.” (Gilbert Cockton)