The management of projects. Typically, this is all about figuring out what's needed, working out how to satisfy that need, costing it out, doing the job and delivering the product/service or whatever.
Some say it's science, some say an art. Whatever. It keeps a lot of pencil-necks in jobs and forms the bedrock of capitalist growth through cost, time and quality controlled efforts.
If you want an example of good project management, take 5 to figure out how they built a pyramid in ancient Egypt.
Getting a shag out of Estelle requires more project management than I can conjure up. You'd need a Harvard MBA to figure out a route into her box.