Scaling of differential equations. The aim of the book is to scale differential equations in order to simplify the settings of parameters in numerical sumilations. The scaling method is presented in a large range of specific ODE and PDE models concerning epidemology, biochemistry, oscillations in classical mechanics and electric circuits, elasticity, viscous fluid flow, gas dynamics, water wave surfaces, thermal convection and porous media flow. Much of the mathematics is accomanied by computer codes (using the programming language Python and the Python package Parampool).