With the increasing effect of globalization and technology, organizations have started to use information systems in various functions to improve their performance. One of the areas that are receiving technological attention is the human resources. There have been introduction, adoption and use of different human resource management systems in both private and public organizations. LAWSON V 9 is one of such information system that has been introduced in the Local Government Authorities in Tanzania. The main objective of introducing LAWSON V 9 is to have accuracy and timely provision of human resource information for managerial decision making. However since its introduction, there is limited empirical study on how it has influenced decision in the LGAs. The objective of this study was to find how LAWSON V 9 has influenced decision making in LGAs. To achieve this objective the study had two specific objectives; first to explore the practices of LAWSON V 9 in LGAs and secondly to examine the influence of LAWSON V 9 on the quality of decisions made in Local Government Authorities. The study adopted a case study design. Simple random and purposeful sampling techniques were employed to obtain a sample of 53 respondents. Data were collected using questionnaires, interview, observation and documentary review. Obtained data were analysed qualitatively and quantitatively by using narrative explanations and Statistical Packages for Social Sciences (SPSS). The study found out that LAWSON V 9 plays a key role in human resource tasks. It captures, store, process and retrieve HR and payroll information from recruitment to retirement. LAWSON V 9 provided accurate data and timely information for HR/Administrators to make good decisions. The study recommends that system infrastructure should be improved by introducing OPTIC FIBRE network to link the system with other systems like EPICOR 9.05, HRHIS and PLANREP3. Trainings to stakeholders and having employee self-service module in the LAWSON V 9 system to access their data with read only.