Which tool is considered the least complex according to business value ranking?

Guesstimation is considered the least complex according to business value ranking due to its reliance on intuition and approximate calculations rather than intricate data analysis or statistical methodologies. This approach allows for quick decision-making without the need for extensive data sets or technical expertise, making it accessible for various stakeholders within a business.

In contrast, OLAP and Visualization Tools, Query, Reporting and Search Tools, and Predictive Analytics involve more sophisticated technology and analysis techniques that require a deeper understanding of data and its implications. These tools can provide more precise insights and detailed analysis, but their complexity necessitates a higher level of expertise to implement effectively and derive value.