Creating a matrix report that includes fields for call center location, agent, calendar month, and first-call resolution is the reporting solution that a consultant should recommend to measure first-call resolution by call center location, agent, and calendar month. A matrix report is a type of report that allows you to group and summarize data by both rows and columns. A matrix report can be used to create a table that shows the first-call resolution rate for each combination of call center location, agent, and calendar month. A matrix report can also be used to apply filters, formulas, charts, or conditional highlighting to analyze the data more effectively. Verified References: Service Cloud Consultant Certification Guide & Tips, Create Matrix Reports