*4.2. Review of Research Model*

In order to evaluate technologies, facilities and services of a smart city from the citizens' point of view, this research, using the SEM and the results of the survey on each item, was applied to the model to assess their suitability and generality. The verification of this SEM was made in two phases.

First, the entirety of the samples from Barcelona and Songdo were put to the SEM to check their suitability. Second, samples of each city were inserted for analysis. If differences are spotted between the cities, the research will analyze their causes to discuss ways for improvement. If the analysis results are similar to the modeling of the existing Customer Satisfaction Index, this SEM can be said to prove its value, at least in part, as a standardized model for a citizens-centric smart city in the future. If this model that deals with multiple technologies, facilities and services of a smart city is statistically significant, it means that it can serve as a tool to evaluate users' satisfaction by regarding multiple TFSs as one smart city, as well as to measure their evaluation on each service or technology at the same time.
