[Excerpt] Self-compacting concrete (SCC) has as its main advantage the assurance of the durability of the concrete structures regardless the work quality during construction. However, notwithstanding this current and strong motivation, it is still not widely applied. This study aims at contributing to the definition of a rational method of composition in volume of the self-compacting concrete, in order for its production to become more accessible. The fact that a simplified process for SCC composition is adopted, based on the proportion in volume of the materials, similar to the process already used for the conventional concrete, may facilitate and potentiate a broader use of this technology, either in new constructions or in the rehabilitation and recovery of existing constructions, improving the quality of the construction and its associated processes, with economic and environmental benefits. A methodology of volumetric composition for the self-compacting concrete has been developed, based on the study of the values regarding several SCC existing compositions, from the similarities between the several compositions analysed, in order to reduce the tests necessary to verify their composition in laboratory and/or in construction site. The definition of this methodology has been based on the study and assessment of the compositions of self-compacting concrete obtained from a wide set of literature, and in the verification of the common points and in the validity interval of certain parameters that characterise SCC’s composition and its features. Once the methodology of the volumetric composition has been developed from the theoretical point of view, it has been tested through experimental mixings carried out both in Laboratory and in an Industrial Unit. Self-compactability has been assessed through the properties of fresh concrete, fluidity and resistance to segregation, gauged by visual inspection and with the Slump-flow, T500 and L-box tests, and of hardened concrete through resistance to compression. SIGNIFICANT RESULTS With this study, values for the essential parameters of the composition have been obtained, which may be used for the definition of the composition of self-compacting concrete. The proximity of the values of the composition’s fundamental parameters, such as aggregates volume, powder volume and paste volume, which vary in a fairly small interval, and the relationship fine aggregates and coarse aggregates, in paste, allows adopting these values in the conception of the SCC composition, based in the proportion in volume of the component materials. Experimental compositions carried out in laboratory and in industry, defined on the basis of these values, have proved the possibility of obtaining SCC with the demandable requirements, verified through the Slump flow and L- box tests, which are very easy to apply “in situ”. The importance of the visual control of the concrete during concreting is critical to observe any seggregation, since in many cases it is the only opportunity to detect seggregation and to correct the used betoning technique. CONCLUSIONS The comparative analysis of the characteristics and of the proportions of the components of several compositions have contributed to the definition of a SCC composition methodology, aiming at the converging towards a rational process of SCC development. The study also confirms that there is a vast diversity of compositions of the self-compacting concrete, and that there is not a single composition for a given application or requirement, which is a reason for investing in the optimization of the compositions for a higher efficiency and economy. It has also been verified that SCC thus produced has features that overcome the traditional concrete, such as the quality of the surfaces’ finishing, the value obtained for the resistance to compression considering the quantity of concrete used, the saving in labour work and energy in its production. Considering the obtained experimental results, in laboratory and in industry, compositions based on the proportions of the materials in volume should continue to be developed, diversifying the materials to use. It is important to analyse and to deepen, in future developments, the relationship between its properties in the hardened status, namely the resistance to compression, and which is the influence of the characteristics of the component materials. It is also important to promote, in the future, the development of compositions based on this methodology and, besides the involvement of Laboratory and, in this case, of Prefabrication Industry, to try to involve other actors from the construction industry, namely Designers and Construction Companies. [.]