## 7 Field Study to Evaluate User Experience of Urban Interfaces
### Selected Urban Interfaces  
The field study was performed in the cities of Monterrey and Mexico City in Mexico, and in Bogota and Cali in Colombia. In each city researchers selected between two to four interfaces belonging to different public and private institutions. Table 3 details the interfaces evaluated. More detailed descriptions of each urban interface are provided below:  
* _Taxi ticketing kiosk in the Monterrey International Airport for purchasing airport transfer._ This interface is located inside the airport building and is the only official means of buying a taxi ticket for an airport transfer service to the city. The kiosk is managed by a private company. It accepts different payment methods: Bank cards and local currency in the form of bank notes and coins. Its target audience includes national and international citizens. Figure 3 provides a general and more detailed overview of the interface. * _ATM CFE-Mitco for paying electricity bills._ This interface is one of the official means for paying electricity bills. It is aimed at the entire population of Mexico and can generally be found inside the offices of the Comision Federal de Electricidad, which belongs to the Government of Mexico. The only accepted payment method is banknotes and coins. See Figure 4 for details. * _Parking Meter of San Pedro Garza Garcia Town Hall._ This device is used to collect payment for outdoor parking in the city's streets. The interface belongs to the Town Hall of San Pedro Garza Garcia, which is located in Monterrey, Mexico. The target audience is any individual who parks their vehicle on a public road Accepted payment method include local currency, bank cards and a mobile app. See Figure 5 for details. * _Mexico City Government Treasury Kiosk._ This kiosk is used by the entire population of Mexico City to perform official bureaucratic processes, such as obtaining birth certificates or paying local taxes. It only accepts bank notes and coins. See Figure 6 for details. * _Metrobus ticket vending machine for public transport in Mexico City._ This machine is can be found at different sites across Mexico City, such as the airport, local bus stations, and in the underground station. It is aimed at local residents and tourists alike. The machine is owned by the Metrobus government consortium. Accepted methods of payment include bank notes and coins, and bank cards. See Figure 7 for details. * _Home Center Self-Checkout Machine in Bogota._ This interface is located inside the shop called Home Center, which sells construction and DIY materials. The self-service checkout provides clients with an alternative way in which to pay for the goods they wish to purchase. See Figure 8 for details. \begin{table}
\begin{tabular}{c c c c} \hline \hline
**Interface** & **Geographical Location** & **Ownership** & **Objective of Interface** \\ \hline Taxi ticketing kiosk & Monterrey Mexico. & Private & Purchase tickets for different taxi companies for airport transfer service. \\ ATM of CFE-Mitco & Mexico City \& & Government & Pay electricity bill. \\ Parking meter of San Pedro & Monterrey Mexico. & Government & Pay fixed rate for parking in the street. \\ Garza Garcia Town Hall & Monterrey Mexico. & & Obtain official paperwork and pay for bureaucratic \\ Mexico City Government Treasury Kiosk. & Mexico City, Mexico & Government & procedures managed by the Mexico City Government. \\ Metrobus ticket vending machine. & Mexico City, Mexico & Government & Purchase public transport tickets for use in Mexico City. \\ Automated parking machine in Cali parking lot. & Cali, Colombia & Private & Pay for parking in private lots and commercial centers. \\ Home Center self-checkout machine Cine Colombia ticketing kiosk & Bogota \& Cali, Colombia. & Private & Pay for items selected whilst shopping. \\ Mio top-up terminal & Cali, Colombia & Government & Buy cinema tickets. \\ \hline \hline \end{tabular}
\end{table} 
Table 3: List of Urban Digital Interfaces Evaluated.