The Deliverable 4.1 Report on Existing Forms of SI synthesizes the research activities conducted in Task 4.1: Differentiating SI from other Innovation of SIMPACT’s WP4. Task 4.1 ran from MM18 to MM 24 and developed along three lines of activities: - the analysis of the “the specificity of social innovation in comparison to other forms of innovation, and particularly with technological innovation, to define differences and similarities, which will be useful in the adoption or adaptation of already established support practices as well as identifying criticalities, gaps and opportunities” (T4.1 Simpact DOW); - the analysis of “the case studies collect in WP3, Task 3.3 in the form of «reverse-engineering», to identify their economic principles, objectives and components (key resources, underlying processes, enabling/supporting technologies etc.) with the aim to optimise business and organisational models for scaling and diffusion” (T4.1 Simpact DOW); the in “depth understanding of the dynamics of how specific and contextualised solutions work, underpinning the proposition that social innovation has the potential to emerge as a driver of the future economy” (T4.1 Simpact DOW); Deliverable 4.1 is organised in 2 main parts that reflect and partially correspond to the structure of T4.1. In particular Part I analysed the differences between SI and other forms of innovation and in particular with technological innovation. Part II is a collection of different contribution provided by the SIMPACT’s partners that offer detailed views and discussions the dynamics that affect SI development processes and business models.