Information Architecture
Is about making the complex clear.
If the information taken (or given) about a company or project is not clearly identified and organised, it can not be realised into a properly functioning tool. Your website. This is done before any spend is considered for design. Alternatively it is undertaken if a website is considering a major overhaul. This foundational document enables design teams and marketing personnel to realise data creatively and effectively.

Project management.
There are many skills brought together to make a website. These must be co-ordinated. At best the individuals must be understood and brought together as sum greater than their parts. With out this the clear becomes complex.