Assistive Environments is a rapidly growing research field where researchers try to introduce state of the art technology into everyday life aiming to improve its quality. Everyone can benefit from it but first and foremost people with special needs such as elderly, disabled or patients. The proposed tool is part of zScope, which is a web based tool that will be able to monitor human behaviour and is responsible for placing and monitoring the various sensors in the environment. It provides functionality for environment layout design and is able to recommend near optimal positions for each sensor, using a message passing algorithm, monitor each sensor’s health and respond to any failures that might occur.