This paper advocates for a more widespread adoption of Software Engineering techniques aimed at informing the design and development stages of Intelligent Environment systems. Reliability is a fundamental principle of all software systems, and even more of Intelligent Environments, which are meant to support people in real life activities. We present a methodological guide which provides strategies and suggestions on how to model, simulate and verify these types of systems. One of our aims is to encourage their use by colleagues working in this area and gather their feedback in this experience.