Hospital Information System (HIS) is a comprehensive, integrated information system designed to manage the administrative, financial and clinical aspects of a hospital. This study is to describe those aspects of the implementation of hospital information system in three tertiary hospitals in Klang Valley; Serdang Hospital, Selayang Hospital and University Kebangsaan Malaysia Medical Centre (UKMMC). A qualitative study was conducted to obtain views on information system development and implementation in the hospitals mentioned above. In-depth interviews with personnel representing both the system providers and the end-users were done guided by a questionnaire. The results of the interviews were categorized into few themes namely the system development, human resource, scope of implementation, support system, user-friendly, training, hardware and security. There were differences in hospital information system development and implementation in the three hospitals. Each system has its own strengths and weaknesses that make it unique. In developing HIS, its important to ensure the system can work effectively and efficiently. Quality human resource, good support system, user-friendly and adequate training of the end-user will determine the success of implementation of HIS. Upgrading of hardware and software as needed is the basis to keep up with the pace of technology advancement and increasing number of patients. It is hoped that HIS will be implemented in all other hospitals with effective integration and networking.