Scope and previous considerations of the study

Although many other aspects can be considered on PSI reuse, this study is just focused on the economic impact and not in other factors, as social impact, accountability of the public administration, transparency of implementations, etc.
These data only affects a part of the overall model. Information analyzed in this study includes only digital information, coming from those public entities described as Public Sector Information holders (PSIH) (Pollock, 2008). These PSIH are the responsible entities for publishing the information. They, sometimes, are not the real aggregators neither the processors of the information.
In the sampling of data, only data coming from Spanish Market has been selected. These data include the companies which are creating value based on PSI based on the analysis depicted for the years 2011 and 2012 by Red.es (Red.es, 2011; Red.es, 2012). Additional data has been collected for the PSI sources available. See it in 7 Annex II. Data sources.
Structure of the document
Next chapter focuses on the theoretical models, and and the value chain of PSI reuse. Also depicts the theoretical contributions of this essay. First: A global model to assess the economical impact, and with further detail for the case of infomediary1 companies. Second theoretical contribution is a metric and a methodology to assess data sources in order to relate them with the economic impact.
Third chapter explains the methodology for the collection of data. It includes both, companies’ data and sources’ data. Then a review of the Spanish market and a description of the analysis to be carried out are provided.
Results are analysed in next chapter from different points of view. Fifth chapter summarizes the conclusions based on the analysed data while sixth chapter provides some guidance for further investigations.
The first Annex includes bibliography, and second further information about the sampling made, and provides examples on how the metric MELODA assesses a dataset.

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