Computer Science is a discipline which requires thinking both in abstract and in concrete terms. On a higher level, computer science is concerned with problem solving modelling and analysing problems, designing solutions, and implementing them. Problem solving requires precision, creativity, and careful reasoning. In A level Computer Science, students learn the principles of computation and algorithms, computer programming, machine data representation, computer systems (hardware and software), computer organisation and architecture, communications and networking, databases, and the consequences of using computing.