This post illustrates a Domain Modeling process using a simple example. As first step, the actual problem is identified. Next, a solution approach is discovered. This is followed by the creation of an initial Domain Model. Afterwards, a first implementation is provided. Then, technical and logical challenges are discussed and solved. Also, the differences between a Domain Model and its implementation are explained. The post ends with a recommendation to use a problem-centric and model-driven approach, even for small projects.