Source: https://www.researchgate.net/profile/Zuriati-Zukarnain/publication/238781277_UPEM_Usercentered_Privacy_Evaluation_Model_in_Per_vasive_Computing_Systems/links/559b2f8f08ae793d1382284b/UPEM-User-centered-Privacy-Evaluation-Model-in-Per-vasive-Computing-Systems.pdf