"Parametric Environment.The handbook of Grasshopper. Nodes & Exercises" aims, in a clear and concise manner, to simplify access to Grasshopper® in two ways. Firstly, to classify each of its building-block components: Params, Maths, Sets, Vector, Curve, Surface, Mesh, Intersect,Transform and Display. Our attention is focused on examining each of these components; its purpose as well as all the parameters provided by the input and output data that are so essential to this plug-in. Secondly, to apply some of these nodes to a series of exercises.