Spider charts (also known as radar charts, polar charts, web charts, or star plots) are a way to visualize multivariate data. They are used to plot one or more groups of values over multiple common variables. They do this by giving an axis for each variable, and these axes are arranged radially around a central point and spaced equally. The data from a single observation are plotted along each axis and connected to form a polygon. Multiple observations can be placed in a single chart by displaying multiple polygons, overlaying them and reducing the opacity of each polygon. An example of the type of data that can be easily displayed by spider charts would be the KPI’s of various assets, where the variables shown on the individual axes could be IRR, NPV, F&D cost, Capex, Opex, Average Daily Production Rate… Each axis shares the same tick marks and scale, but the way the range of variable values maps to this scale can vary between the displayed variables. For example, if one variable is IRR, which is measured in %, and another is NPV which is measured in $MM,  these measures need to be converted to a scale of units shared between the axis. Grid lines connect the axes and are used as guideline to make the chart more easily readable