Reviewing all existing work products at the commencement of a new workflow helps to ensure this. Where originals of document cannot be retained by the project team, photocopies should be made. A register of information collected should be established and maintained. It is likely that much information relevant to later stages of the project will be identified during reviews. This should be cross referenced in such a manner as to make it easily accessible later in the project.
Additional information is gathered during each of the core workflows.
As the diagram above shows, the Gather Additional Information task is performed concurrently with the tasks which develop the work products. There are a wide variety of information gathering techniques that can be used. While all of these techniques can be appropriate in different situations, the first four and in particular interviewing and workshops are the most relevant. Workshops always involve groups of people. Workshops should be formally facilitated.