In this paper a new approach for building networked embedded software is presented. The approach is based on the composition of reusable components with the addition of a perspective contract principle for modeling non-functional properties. Nonfunctional properties are an important aspect of networked embedded software, and this is why they are modeled separately. As such, the component view presented here differs from traditional component based views, where focus is laid on the functional part. The ideas discussed in the paper have been implemented in a tool. This tool enables the construction of networked embedded software by means of components and perspective contracts. Currently, a queuing network based algorithm that considers all non-functional properties together performs a static analysis on the perspective contracts before execution of the application.