Which of the following tools is NOT part of the analyze phase of a Six Sigma project?

The Gantt chart is not part of the analyze phase of a Six Sigma project because it is primarily a project management tool used to schedule and track the progress of tasks over time. Its primary purpose is to provide a visual representation of the timeline and allocation of resources, helping teams understand what needs to be completed and when.

In contrast, tools like histograms, control charts, and fishbone diagrams are specifically designed for data analysis and process improvement. A histogram helps visualize the distribution of data points, which can reveal patterns or variations. A control chart monitors process stability over time, identifying trends or anomalies that may require further investigation. A fishbone diagram, also known as an Ishikawa diagram, assists in identifying and analyzing the root causes of problems within a process. These tools are essential in the analyze phase as they help teams to pinpoint issues and guide improvement efforts effectively.