The purpose of a WBS dictionary is to provide:

A.
additional details for each component of the WBS, and for each component provide a brief
definition of its statement of work, outputs, actual activities and pertinent milestones.

B.
a detailed glossary of terms used in the WBS.

C.
written authorization to sanction work on a particular work-package within the WBS, and define
the methods for its implementation and the monitoring of its performance.

D.
a hierarchical decomposition of the work to be undertaken to address the objectives and meet
the requirements of the project at the lowest

Explanation: