In an SROI analysis, an alternative scenario is always assumed in order to consistently subtract impacts that would also result from any substitute services as deadweight. Since we worked with already existing data from the SAFE longitudinal study, the scenario is based on the alternative being the absence of the SAFE programme, but the parents and children participating in a non-bonding-oriented prevention programme called "GUSTA" (acronym for German "Guter Start", meaning good start). This means that the social added value would be correspondingly significantly higher if the absence of the GUSTA programme were also calculated.

In total, on the basis of the surveys and calculations carried out here, monetised impacts of around 3 million euros result for the eight selected SAFE model courses in Germany. This compares to investments of around 161 thousand euros. By comparing the total investments in the model courses to the sum of the monetised impacts, the SROI value is 18.68. This means that each invested euro creates impacts with a monetised equivalent value of 18.68 euros. The investments are thus returned more than 18-fold as positive impacts on society as a whole - a comparatively high SROI value and thus a very high added value for society.

For the three selected SAFE model courses in Austria, the total monetised added value is around 1.37 million euros. The investments amount to a total of around 69 thousand euros. The ratio between investments and total added value results in an SROI value of 19.72.

Under one scenario, it is assumed that in the case of insecure or disorganised attachment, another quarter of the SAFE children have the same benefit as the securely attached children. The available data showed that indeed less securely attached children were also positively affected. Nevertheless, this effect was not taken into account in the basic calculation in order to obtain a well-supported SROI value. If this effect is nevertheless included, the SROI value increases to 32.12 for the eight SAFE model courses in Germany. If this additional effect is taken into account for the three SAFE model courses in Austria, the SROI value increases to 29.09. These are comparatively extremely high values. The main reason for this is the strongly preventive character of the services provided in the SAFE programme, especially for the stakeholder groups of children and infants, parents and siblings. Several impacts occur over a long period of time and have a significant impact on the lives of those affected. At the same time, the intervention is comparatively inexpensive.

The present study thus once again shows the meaningfulness of prevention projects, with a view to the added value for society. All in all, the SAFE - "Safe Education for Parents" - programme is a very effective prevention concept for promoting healthy attachment relationships between parents and children. This makes a very significant contribution to societal added value, especially from a long-term perspective.