The objective is twofold. Firstly, to promote the quality of Spanish scientific research by recognising the best centres and units that stand out for the relevance and impact, at international level, of the research results obtained during the previous reference period. In addition to the recognition of the best research centres and units in our country, the call finances the strategic plans or strategic research programmes proposed, respectively, by the centres or units, aimed at consolidating their scientific capacities, contributing to the leadership of Spanish research and acting as poles of attraction for talent at international level. The accreditation and the support for the implementation of the strategic plan or strategic research programme have a duration of four years and are obtained through an evaluation and selection process based on scientific criteria and in accordance with the most demanding international standards.