Transparency is a critical quality criterion to modern democratic societies. As software permeates society, transparency has become a concern to public domain software, as eGovernment, eCommerce or social software. Therefore, software transparency is becoming a quality criterion that demands more attention from software developers. In particular, transparency requirements of a software system are related to non-functional requirements, e.g. availability, usability, informativeness, understandability and auditability. However, transparency requirements are particularly difficult to validate due to the subjective nature of the involved concepts. This thesis proposes a transparency-requirements-driven intentional development of transparent software. Transparency requirements are elicited with the support of a requirements patterns catalog, relatively validated by the stakeholders through argumentation and represented on intentional models. Intentional models are fundamental to software transparency, as they associate goals and quality criteria expected by the stakeholders with the software requirements. The goals and quality criteria also justify the decisions made during software development. A system was implemented as an intentional multi-agents system, i.e., a system with collaborative agents that implement the Belief-Desire- Intention model and that are capable of reasoning about goals and quality criteria. This thesis discusses important questions to the success of our approach to the development of transparent software, such as: (i) forward and backward traceability; (ii) a fuzzy-logic based reasoning engine for intentional agents; (iii) the application of an argumentation framework to relatively validate transparency requirements through stakeholders’ multi-party agreement; and (iv) collaborative pre-traceability for intentional models based on social interactions. Our ideas were validated through case studies from different domains, such as ubiquitous computing and Web applications.