Team member differences can be found in various characteristics and be seen as both perks and perils. But what makes one group focus on certain dimensions and differences’ positive implications, while another collective notices other aspects and sees trouble ahead? We address this question in the context of interorganizational teams’ first stages, when impressions are limited and valuations must be made promptly. Our findings from in-depth interviews offer a sensemaking perspective on perceived otherness and explicate when and why differences are interpreted as helping or hindering collaborative practices. Moreover, we illuminate how coorientation and representation dynamics shape otherness perceptions and valuations.