The document describes a project defect model used at Ericsson to control project quality and performance. It tracks defects inserted during phases like specification and design, and detects defects during testing phases. This provides early signals about quality risks. On a pilot project, the model helped clarify requirements, enforce design rules, and focus testing. It accurately predicted defects at release, allowing better planning. The model has now been adopted for several projects to improve quality tracking, risk management, and decision making.