@conference {757,
	title = {Alexa vs. Siri vs. Cortana vs. Google Assistant: A Comparison of Speech-Based Natural User Interfaces},
	booktitle = {Advances in Human Factors and Systems Interaction},
	year = {2017},
	month = {06/2017},
	publisher = {Springer International Publishing},
	organization = {Springer International Publishing},
	address = {Cham},
	abstract = {<p>Natural User Interfaces (NUI) are supposed to be used by humans in a very logic way. However, the run to deploy Speech-based NUIs by the industry has had a large impact on the naturality of such interfaces. This paper presents a usability test of the most prestigious and internationally used Speech-based NUI (i.e., Alexa, Siri, Cortana and Google{\textquoteright}s). A comparison of the services that each one provides was also performed considering: access to music services, agenda, news, weather, To-Do lists and maps or directions, among others. The test was design by two Human Computer Interaction experts and executed by eight persons. Results show that even though there are many services available, there is a lot to do to improve the usability of these systems. Specially focused on separating the traditional use of computers (based on applications that require parameters to function) and to get closer to real NUIs.</p>},
	keywords = {Human factors, Intelligent personal assistant, Smart device},
	isbn = {978-3-319-60366-7},
	doi = {https://doi.org/10.1007/978-3-319-60366-7_23},
	url = {https://link.springer.com/chapter/10.1007/978-3-319-60366-7_23},
	author = {L{\'o}pez, Gustavo and Quesada, Luis and Guerrero, Luis A.},
	editor = {Nunes, Isabel L.}
}
@conference {755,
	title = {Developing a Proxy Service to Bring Naturality to Amazon{\textquoteright}s Personal Assistant {\textquoteleft}{\textquoteleft}Alexa{\textquoteright}{\textquoteright}},
	booktitle = {Advances in Human Factors and Systems Interaction},
	year = {2017},
	month = {06/2017},
	publisher = {Springer International Publishing},
	organization = {Springer International Publishing},
	address = {Cham},
	abstract = {<p>Amazon{\textquoteright}s Alexa is an intelligent personal assistant, developed to be used jointly with a Bluetooth Speaker and microphone hardware called Amazon Echo. Even though Alexa is supposed to be a natural user interface, its use is not very natural. As a user is intending to use Amazon{\textquoteright}s Alexa system, they must follow a very tighten and structured way to provide the commands for the system to achieve its goal. In this paper, we propose a proxy service called {\textquoteleft}{\textquoteleft}Plis{\textquoteright}{\textquoteright}. This service was developed as a Skill to be used with the Amazon Echo. Therefore, a user can say: Alexa, {\textquoteleft}{\textquoteleft}plis{\textquoteright}{\textquoteright} and our functionality will start its job. Our skill determines from the natural way in which the user speaks what they are asking for. With that information, we create a query that would be further sent to other skills already providing the functionality required.</p>},
	keywords = {Alexa, Amazon Echo, Intelligent personal assistant},
	isbn = {978-3-319-60366-7},
	doi = {https://doi.org/10.1007/978-3-319-60366-7_25},
	url = {https://link.springer.com/chapter/10.1007/978-3-319-60366-7_25},
	author = {Carvajal, Luis and Quesada, Luis and L{\'o}pez, Gustavo and Brenes, Jose A.},
	editor = {Nunes, Isabel L.}
}
