Once, an idea is generated, next step is to identify a product/process to resolve the specific difficulty for a user/user group.
The PDC consist of the various sections as User, Purpose, Experience Functions, Features, components and validation/re-validation.
Working on a PDC is an iterative exercise, once done first-hand, more and more revisions will enhance the product development spine. Create versions, more of it over a period of time. Improve each version or break-it-down to specific needs of the visualized product.