This presentation first defines a software development approach based on four types of design models used at four different phases of the software development lifecycle. Then, a specific quality objective, named Model Quality Objectives (MQO), is proposed for each type of model. Each objective is defined as a set of quality characteristics with some measurable criteria named Model Quality Requirement (MQR). Some additional guidelines are provided to manage the planning and quality assessment activities related to MQO and MQR. This presentation concludes with some expected impact on the adoption of MQO by the automotive industry and the preliminary results on its deployment.