This chapter argues that, contrary to the views of the consensus sceptics, consensus processes pervade science. Using examples from a range of scientific areas, it shows how consensus is involved in generating ideas and setting priorities, assessing funding applications and distributing access to resources, selecting methods to use in a research project, publication of scientific findings, reviewing the published literature and drawing conclusions on facts. Taking a specific example of a research project, it identifies ten points during the research where consensus processes were involved.