A disease diagnosis system is a system which can diagnose diseases through checking out the symptoms. A knowledge based diagnosis system which makes use of inference engine is developed for diagnosis of diseases based on the knowledge given by doctors in the system. The system helps to solve the gap between the availability of doctors and medical professional experts in the diagnosis and treatment of malaria in Nigerian government hospitals and health centers. An expert system was developed using visual basic 6.0 and microsoft access as database. The research adopted Structured System Analysis and Design Methodology(SSADM) as its software methodology approach. The software was recommended for use to all public government Nigerian owned health centers and hospitals.

Big data is a key concept that cannot be overlooked in the IT world considering the prominent increase in data, and data related services, it is important to explore this field and look at ways to improve data service delivery especially in the cloud. Cloud computing on the other hand helps in tackling the issue of storage and data service. This research focuses on the two key concept big data and cloud computing and some of the issues and challenges that are inherent with the deployment of cloud services and big data. The study shows that security challenges is among the most prominent issue in cloud and big data services. The privacy issue and some other issues such as the issue of hetrogeneity and data governance in handling big data were observed. Also the issue of disaster recovery for organisations data was also dicussed which if good recovery mechanisms are implemented will help improve cloud services. After considering some of the issues associated with big data and cloud computing, some solution were suggested towards improving the two key concepts which will go a long way in increasing the adoption rate of cloud computing by organizations. It is important for organizations to consider the nature of how their data will grow in the future before deploying any cloud service in their business