Source: Image of Megaphone, Public Domain http://commons.wikimedia.org/wiki/File:Megaphone.svg Image of Design Brief, Public Domain http://blog.spoongraphics.co.uk/wp-content/uploads/2010/logo-design/brief.jpg
Planning is an organizational way to develop an approach to a project.
Core message is the main point being conveyed through the design project.
Scope is how in-depth the project is going to be. This is measured by the amount of time and work is involved.
A design brief is a document prepared by the designer or design group for the client that overviews the proposed project.
Budget is the amount of money allocated to the project.
Stylistic approach is the type of style or look the designer will use for the client.