The relevance of this thesis is in addressing information systems business leadership HRIS use issues.The thesis explains acceptance and use issues central to Human Resource Information Systems (HRIS) within South African State Owned Agencies (SOAs). Organisations typically deploy HRIS with a view to automate Human Resource (HR) service delivery and administrative functions. Among other values, HRIS produces useful data and information which optimises HR operations and improves decision-making. However, the use of HRIS, notably within SOAs, is poorly understood owing to inadequate literature and contextualised studies. Despite the tremendous amount of investment into such systems, SOAs continuously identify emerging challenges and issues pertinent to HR operations and administration. For instance, despite HRIS automation, job applications and recruitment are still manually processed, which means that the costly implemented HRIS is not effectively used, and is thus underutilised. The burning questions for business leadership remain - why is HRIS not optimally utilised given significant organisational investment on such systems, and the mixed return-on-investments? The other question relates to what the level of acceptance is and actual use of these HR systems. There is also a need to determine to what extent do these systems enable or improve the delivery of human resource services and administration. Moreover, what influences the use of HRIS? Previous literature and organisational practice inadequately addresses these questions. This thesis, therefore, addresses these key issues to bridge these preceding knowledge gaps. In order to explain the use and subsequent effective use of HRIS, the study triangulated three theories as theoretical lenses. These theories are the Unified Theory of Acceptance and Use of Technology (UTAUT), Self Determination Theory (SDT), and the Representation Theory (RT). These theories are employed to explore and explain the individual use, and subsequent effective use of HRIS. In this respect, the ontological stance for this thesis is that reality is objective. Thus, the study followed a positivist research paradigm, whilst the research the approach was deductive. A survey research strategy was employed during the study to obtain primary data. Survey participants included executives and individuals from speciality units e.g. HR, Finance, Supply Chain, Support departments (including IT and Help Desks) as well as other HRIS users. Participants were drawn from various South African SOAs. Structural equation modelling and hypothesis testing show that there are myriad of determinants influencing use and effective use of HRIS. The results further show that certain constructs are inconsistent with the existing literature. Nevertheless, this inconsistency speaks to the unique South African SOA contexts. The outcome of the study is a model which theoretically and practically explains those factors which must be considered to effectively use and utilise HRIS. That is, the theoretical, practical, methodological, and contextual contributions of the thesis is in explaining the determinants which are significant for effective use of HRIS. / Centre for Business Manangement / D.B.L.