This is the opening presentation for module 3 of the 5-module course on digital preservation tools for repository managers, presented by the JISC KeepIt project.This module is a primer on preservation workflow, formats and characterisation, as preparation for the preservation planning tools to be encountered in module 4. For more on this and other presentations in this course look for the tag 'KeepIt course' in the project blog http://blogs.ecs.soton.ac.uk/keepit/