In the context of the development of commercial offers in increasingly fierce competition market, the following observations have been drawn: - for companies, the number of direct solicitations or bidding is increasing and bidders companies must streamline, systematize and make more reliable their offer definition process, - because of this increasing level of work, companies cannot longer realize detailed studies and then, take significant risks when the affairs are realized after acceptance. These two findings justify the requirement about a formalized bidding process aided by decision support tools in order to quickly propose ad hoc and precise offers with a high level of confidence. Therefore, the OPERA project is based on the hypothesis that an offer is composed of a technical solution associated with a realization project. It proposes: - the definition of a bidding process based on two key activities: (i) development of offers with regards to a global confidence indicator and (ii) risk analysis, - the development of decision making tools (OPERA platform) based on knowledge and experience intensive reuse for offers definition and risk engineering, - the definition of core concepts: (i) solution readiness, (ii) project maturity and (iii) confidences in order to define a global confidence indicator for an offer and then, reduce uncertainties and imprecision about its characteristics, - the exploitation of global confidence indicator for the multi-criteria selection of promising offers. In the OPERA project, when the confidence is higher and the risk assessment better, the effective realization of the affair will be much closer to the expected attempts. The imprecision and uncertainties about the offer characteristics (performance, delay, cost…) will be reduced. The bidder will have a higher confidence into the offer and potential negotiations will be easier to drive. From a scientific viewpoint, the OPERA project is based on four requirements about the study, the definition, the formalization and the validation of: - Four new key performance indicators (KPI) which characterize the confidence of an offer with different aggregation mechanisms, - Principles of exploitation of these four KPIs in order to take into account imprecision and uncertainties about offers characteristics and to support the multi-criteria selection, - The organization of experience and knowlede bases dedicated to risk associated with the definition of reasoning principles to exploit them, - Principles of selection of the offer to submit to the customer. The OPERA project is based on a well-balanced consortium composed of four industrial partners and three academic partners. The industrial partners are diversified following two activity sectors (services and systems development). The three academic partners are used to work together on research projects. The different prototypes which have been developed during the past years as well as the published scientific articles referenced into the web of science database are a proof of a high maturity level. The division of the project into five operational work packages, its 42-month duration and its agile development process based on four iterations lead to a low level of risk. In conclusion, the OPERA project proposes a methodology and a decision support tool which can support the bidding process. This tool, based on intensive exploitation of capitalized knowledge and experiences, will permit to develop offers and to evaluate them on original criteria and finally improve companies’ competitiveness.