When working with Power BI, what is necessary to maximize the effectiveness of data visualization tools?

To maximize the effectiveness of data visualization tools in Power BI, ensuring that the underlying data is accurate and well-structured is essential. Accurate data forms the foundation of any insightful analysis; if the data is incorrect, the visualizations built upon it will also be misleading or incorrect. Well-structured data is equally important as it enables smooth processing and effective analysis, making it easier for users to derive meaningful insights from the visualizations.

When data is organized and formatted correctly, it allows for better filtering, aggregation, and manipulation within Power BI. This ensures that the visualizations created truly reflect the underlying trends, patterns, and relationships, ultimately leading to better decision-making and understanding of the data.

The other options do not contribute to effective data visualization in the same way. For example, limiting data to only numerical values restricts the breadth of analysis and insight that can be gained from qualitative data. Adopting complex formatting styles might make visuals look appealing but can confuse the audience if they obscure the clarity of the data being presented. Finally, while managing data sources is vital, limiting them without considering their relevance can lead to incomplete analyses and missed opportunities for insights.