From DT Online
A Policy may be described as a set of guidelines that provide a framework for achieving a purpose or goal. Policies should be short, written in simple language and represent the consensus view of all affected by them.
To achieve this, separate Policies might be produced, each covering a particular aspect of working practice. These can be cross-referenced and any requirement for factual data or detailed explanations (e.g. exam syllabus requirements) can be held in linked Appendices and need not interfere with an initial comprehension of the main points of the Policy .
Evaluation and review of Policy should take place on a regular basis.