Students can choose from seven first order differential equations and set the interval, initial value and step size. The applet then shows the graph of the exact solution along with a numerical solution using one of the four methods: Euler, implicit Euler, Heun or Runge-Kutta. Sudents do not need to compute anything. The explanation fails to say \(x_0\) is the same as \(a\), which is the left endpoint. Also the four methods are listed, but only Euler's method is explained. While there is a reference for Runge-Kutta, there are none for implicit Euler or Heun.