I'm fairly new to this. I'm trying to build a WBS for communications equipment installation. This requires things like licenses, electrical conduit, parts ordering, and outsourcing to other organizations. It seems that a deliverable oriented WBS would be best for the project, but once I get to the 3rd layer, it seems natural to the components of the deliverable into the tasks necessary to produce the components. Would a WBS that mixes types in this way work well, or will I run into problems when converting this to a network and project schedule?
A product oriented WBS would have products on top, broken down to its manageable sized components, and then activities below it. I define the work package to be the lowest level of product; the activities below it enable size estimation. You should not have any issues scheduling a WBS such as this.