How to phrase potential contributions in thesis proposal?

I am pursuing PhD in Computer Science. I am working on writing my PhD dissertation proposal.

My main contribution in my work is going to be about data classification and prediction model.

How should I phrase my potential contributions / tasks in which technical contribution is about clustering/classification and prediction?

I am also planning to propose potential performance improvement in clustering / classification techniques that currently exist in my domain. What all should I plan to achieve? How can I go about phrasing it in the proposal?

I know most answers cannot be specific to my question but any pointer towards direction that I should take...where to look for answer etc. regarding this is much appreciated...