An Extension and Validation of the Task-Technology Fit: A Case of a Mobile Phone Voting System Noluntu Mpekoa ( ✉ ) and Aaron Bere Central University of Technology, Bloemfontein, South Africa {nmpekoa,abere}@cut.ac.za Abstract. Literature has emphasized on human computer interaction as the backbone of technology use and acceptance. The authors made use of the task- technology fit theory and argue that any pre-occupation with the theory from the perspective of task and technology characteristics that does not embrace the user technology self-efficacy is unrealistic and unauthentic. Contributing to debates on task technology fit theory; this study provides self-efficacy as an antecedent for mobile phone voting task technology fit. The purpose of this study is to empirically examine the possibility of extending the task technology fit theory by cooperating self-efficacy to the task and technology characteris‐ tics within the voting context. The participants voted for their representatives using a mobile phone voting application. Data was collected using a self- completion questionnaire and the partial least squares was employed. The proposed model displayed a good fit with the data and rendered satisfactory explanatory power for mobile phone voting. Keywords: Mobile phone voting · Mobile phone adoption · Technology use · TTF 1 Introduction The Unicef [24] report indicates a 30 % growth per annum, for mobile phone adoptions in Africa within the 2002–2012 period. Sanou [22] the director of the International Telecommunications Union (ITU) claim that the number of mobile-broadband subscrip‐ tions will reach 2.3 billion by the end of 2014, with 55 % of them in developing countries. Availability of low cost handsets and cheap SIM cards contributed to the 20 % increase in the embracement of mobile phones in South Africa from 2005 to 2010, particularly among the youth [24]. The world’s emerging economies are speculated to foster economic and social development through the appropriation of Information Communi‐ cation Technologies (ICTs) in form of mobile systems. This study identifies voting as one of the essential areas that mobile technologies can foster a quantum leap of evolution in servicing development for the resource constrained nations. The focus of the study is based on mobile technology use and acceptance within the voting environment. Literature has emphasised on Human Computer Interaction (HCI) as the backbone of technology use and acceptance. Several studies have reported on various technology adoption frameworks that addresses technology use and acceptance. Among these © Springer International Publishing Switzerland 2015 T. Tryfonas and I. Askoxylakis (Eds.): HAS 2015, LNCS 9190, pp. 538–546, 2015. DOI: 10.1007/978-3-319-20376-8_48