This research focuses on the study of the processes of collaborative solving of information problems and their impact on group learning outcomes. Forty-nine pairs of students solved three learning tasks with learning goals of increasing complexity: information selection, information interpretation, and interrelating concepts. We analysed two types of data: group work processes and group learning outcomes. The group work processes were assessed using eight dimensions, and group learning outcomes were evaluated in two ways: quality of the group written product, and shared correct knowledge. Findings reveal the significant influence of some aspects of the group work processes (such as searching for information, processing information, shared task regulation, the construction of shared knowledge, and emotional climate) in the group learning outcomes. Results also show that this influence is most evident in tasks with more complex learning demands. Finally, some educational proposals for school education are provided.