Microsoft’s pioneering spreadsheet package, Excel is a must-have application for anyone interpreting data on scale. It’s data visualisation options remain industry-leading, presenting an array of sorting, structuring and presentational options for adding meaning to your figures. At a basic level, you can chart, sort, and sum your data. For more advanced requirements, there are pivot tables, and more complex data structures. With Excel formula, you can even extrapolate secondary data from the raw data you analyse, with extensive resources available online and elsewhere to help with your formulae if you get stuck. Excel is seriously important for any serious CRO campaign, so it pays to get familiar with it, and in particular its data visualisation functions if you’re not already.