According to the PMI Guide to Business Analysis, a data dictionary is a tool that defines and describes the data elements and their attributes in a consistent and standardized way. A data dictionary can help to minimize the risk of misunderstanding or misinterpreting data items mentioned in the requirements documents, as it provides a common language and reference for all stakeholders involved in the project. A data dictionary can also help to ensure the quality, accuracy, and completeness of the data requirements. Planning a peer review, asking for a formal acceptance, or holding a workshop are other ways to improve the clarity and understanding of the requirements specification, but they do not address the specific issue of defining and describing the data items. References: PMI Guide to Business Analysis, page 169-170.