According to the PMBOK® Guide, the WBS Dictionary is a document that provides detailed deliverable, activity, and scheduling information about each component in the Work Breakdown Structure (WBS).

The Purpose of the Dictionary: Because the WBS itself is a graphical or hierarchical chart, it often lacks the space to provide specific details. The WBS dictionary supports the WBS by providing the " narrative " or definition for each work package.

Contents of a WBS Dictionary: Information in the WBS dictionary may include, but is not limited to:

Code of account identifier.

Description of work.

Assumptions and constraints.

Responsible organization or individual.

Schedule milestones.

Associated schedule activities.

Resources required.

Cost estimates.

Quality requirements.

Acceptance criteria.

Technical references.

Scope Baseline: Together, the Project Scope Statement, the WBS, and the WBS Dictionary form the Scope Baseline for the project.

Analysis of Other Options:

B. chart: A WBS chart is simply the visual representation (the tree structure) of the work. It shows the hierarchy but does not typically contain the " detailed descriptions " required to execute the work.

C. report: While WBS information can be included in various project reports, there is no formal PMBOK® document called a " WBS report " that serves as the repository for component descriptions.

D. register: A register is typically used for tracking dynamic lists that change throughout the project (e.g., Risk Register, Stakeholder Register, Issue Log). The WBS details are considered static baseline information and are housed in the dictionary.