*Problem Formulation*

The problem formulation for the present work is based on a systems-thinking perspective to avoid poor problem formulation.


**Citation:** Gonzalez-Aguirre, J.A.; Osorio-Oliveros, R.; Rodríguez-Hernández, K.L.; Lizárraga-Iturralde, J.; Morales Menendez, R.; Ramírez-Mendoza, R.A.; Ramírez-Moreno, M.A.; Lozoya-Santos, J.d.J. Service Robots: Trends and Technology. *Appl. Sci.* **2021**, *11*, 10702. https://doi.org/ 10.3390/app112210702

Academic Editor: Luis Gracia and Carlos Perez-Vidal

Received: 1 October 2021 Accepted: 26 October 2021 Published: 12 November 2021

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School of Engineering and Sciences, Tecnologico de Monterrey, Eugenio Garza Sada 2501 Sur, Monterrey 64849, Mexico; a01382394@itesm.mx (J.A.G.-A.); a00823223@itesm.mx (R.O.-O.); a01197734@itesm.mx (K.L.R.-H.); a01731990@itesm.mx (J.L.-I.); mm@tec.mx (R.M.M.); ricardo.ramirez@tec.mx (R.A.R.-M.); mauricio.ramirezm@tec.mx (M.A.R.-M.)


Based on the previous statements, this research problem is classified by its objective complexity as a Wicked Problem. It has no clear stopping rules since there is no definitive "problem" and "solution," and the problem ends with the consumption of the resources (time, energy, others).
