We present ParTraP and its associated toolset, supporting a lightweight approach to formal methods. In critical systems, such as medical systems, it is often easy to enhance the code with tracing information. ParTraP is an expressive language that allows to express properties over traces of parametric events. It is designed to ease the understanding and writing of properties by software engineers without background in formal methods. In this tool demonstration, we will present the language and its toolset: compiler, syntax directed editor, and a prototype generator of examples and counterexamples. Abstract. We present ParTraP and its associated toolset, supporting a lightweight approach to formal methods. In critical systems, such as medical systems, it is often easy to enhance the code with tracing information. ParTraP is an expressive language that allows to express properties over traces of parametric events. It is designed to ease the understanding and writing of properties by software engineers without background in formal methods. In this tool demonstration, we will present the language and its toolset: compiler, syntax directed editor, and a prototype generator of examples and counterexamples .