Object-Oriented Programming (OOP) is a computer programming method based on 'objects', in which data are closely linked to the procedures that operate on them. For example, a circle on the screen might be an object: it has data, such as a centre point and a radius, as well as procedures for moving it, erasing it, changing its size, and so on. The technique was originated with the Simula and Smalltalk languages in the 1960s and early 1970s, but it has now been incorporated into many general-purpose programming languages, and forms the basis of the 'Visual' series of languages from Microsoft. Research Object-Oriented Programming