Object oriented design.
Paper relating to object orientation.
Your paper can be either an investigation or a survey. If the former, your paper should present an interesting problem or technique relating to object orientation.
It should state the problem, provide background and motivation, and describe novel approaches (proposed by others or by you). Your paper might or might not require programming, depending on its focus.
Alternatively, if you write a survey, it should be based on key papers related to the area you choose. Regardless of whether your paper is an investigation or a survey, it should include key references and should run about 12-16 double-spaced pages in length.