## 3 Results
### Using AGEM-S Decision Support and Knowledge Transfer Functionality in Practice  
Whether or not a decision support tool will ultimately deliver the intended significant decision support functionality is largely influenced by the development process, during which developers need to determine the methodology to be used. In general, the main objective is user-friendliness, and therefore the model developed is simplified. The Bellagio STAMP (Sustainability Assessment and Measurement Principles) [66], developed in 1997 by leading experts and revised and modified in 2009 with broad stakeholder participation, is a suitable tool for developing a decision support tool that is highly functional in all aspects, based on the principles [67]. The eight principles of the new Bellagio STAMP include (1) Guiding vision; (2) Essential considerations; (3) Adequate scope; (4) Framework and indicators; (5) Transparency; (6) Effective communications; (7) Broad participation; and (8) Continuity and capacity [66]. Bellagio STAMP is also suitable for evaluating decision support tools [67]. On the basis of Bellagio STAMP, AGEM-S can be described as follows:  
1. Guiding vision: ensuring needs within the capacity of the biosphere to sustain the potential of future generations. The principle is indirect, as it focuses on the possibilities of reducing ammonia emissions from pig farming, with reference to legal (NEC Directive) [9] requirements. 2. Consideration of the underlying social, economic and environmental system; the multiple dimensions of sustainability; current trends; and drivers of change, risks, uncertainties, and implications for decision making. The planning process was preceded by a preliminary study of the pig sector and analysis of trends in the European context, but an assessment of uncertainties and possible implications for decision making was not carried out. 3. Appropriate time horizon and geographical scope: the factors used for the estimation are only partly country specific (nutrition), while the typical technologies take into account local specificities. The time scale of the model is one year, and improvements can be tracked using the copy/modify function. 4. Framework and indicators: AGEM-S is a well-defined framework, in terms of the input data, the emissions and correction factors used for the calculation, the influencing factors included in the calculation, and the assessment methodology. 5. Transparency: full transparency of the development is partially achieved. A detailed report documenting the design of the system has been submitted to the supporting Ministry of Agriculture, but no peer-reviewed publications have been published to date. The operation of the system is also documented in detail for the users. 6. Effective communication: AGEM-S satisfies this principle. It uses easy-to-understand language to communicate the results and presents them in a comprehensive, graphical way, thus enabling users to better understand the processes affecting farm-level ammonia emissions and the effects of their changes. 7. Extensive participation in the development: during the development of AGEM-S, the experts for each module were selected from the respective disciplines. The IT tasks were carried out by IT specialists and the Hungarian Pig Breeding Association (MSTSZ) ensured effective communication between farmers and developers through its field representatives and were involved in the preliminary surveys, the definition of the input data set, and the testing of the system. 8. Continuity and capacity: AGEM-S is capable of producing re-estimates on an annual basis. The estimation system can be used to track the annual variation in farm ammonia emissions. The potential for improving the system through the incorporation of new scientific results (factors, techniques) is a targeted and obvious goal. AGEM-S is designed to be functional not only to assist farmers but also to support regional and national decision-making processes.