This document discusses the quality optimization and recommendation methodology of SmartDelta. Three different tasks are performed which are: software quality trend analysis and prediction, similarity analysis and reuse recommendation, and change impact analysis and prediction. These tasks lead to three key innovations areas which are novel ML-based anomaly and threat detection methods, automatic code analysis and change impact analysis approaches, and similarity analysis approaches and recommendations. More than 20 tools were developed in this work package for software quality optimization and recommendations.