A "knowledge worker" is one who thinks for a living and includes such professions as doctors, lawyers, accountants, engineers, designers, and, yes, even lowly innovation consultants.
How do you know you're working on a knowledge work project? Well, they may have the following characteristics in common:
Knowledge projects are excellent candidates for an agile or adaptive approach to project management, due to their uncertainty. You can expect a high degree of change, complexity and risk with knowledge work projects.
Consider using an agile approach on knowledge work projects, such as scrum or kanban.