An Object-Oriented Analysis and Design Process

Object-oriented analysis (OOA), design (OOD) and programming (OOP) are related but distinct. OOA is concerned with developing an object model of the application domain. So, for example, you take the problem statement, generate a set of features and (possibly) use cases,² tease out the objects and some of the methods within those objects that you'll need to satisfy the use case, and you put together an architecture of how the solution will hang together. That's object-oriented analysis.

OOD is concerned with developing an object-oriented system model to satisfy requirements. You take the objects generated from your OOA, figure out whether to use inheritance, aggregation, composition, abstract classes, interfaces, and so on, in order to create a coherent and efficient model, draw the class diagrams, and flesh out the details of what each attribute is and what each method does, and describe the interfaces. That's the design.