Improving Usability with Think Aloud and Focus Group Methods. A Case Study: An Intelligent Police Patrolling System (I-Pat). - Tania Calle-Jimenez; Doris Tutillo-Sanchez; Sandra Sanchez-Gordon; Janio Jadán-Guerrero; César Guevara; Patricio Lara-Alvarez; Patricia Acosta-Vargas; Luis Salvador-Ullauri; Isabel L. Nunes (AHFE (8), 2019)