A deck arrives as copy that has already been agreed, figures that have already been checked and a logo that already exists. It is laid out: type sizes and colours set once and applied throughout, headings and lists given a visible order of importance, section dividers where the argument turns, and charts and tables that already exist brought into the same system with the Business Presentation and the Extended Presentation.
It comes back in two files. The PowerPoint file is built on slide masters, so the next person to edit it inherits the style instead of fighting it; the PDF is the same deck for sending on and for printing.
Copywriting and work on the data behind a chart are both quoted separately in writing, before anything is done, and neither is started until you have agreed to it. Everything else outside the packages is listed in full on the How it works page.