Editor of Clinical Guidelines, Directorate of Health, Iceland
Commissoning
This has many meanings depending on the situation / reference. Relating to HTA it adaptation is the deligation of some task/assignment to an individual or group. This usually involves transferring some authority and responsibility to those being asked/ordered (commissioned) to performe some task.
Planning
Describes the a priori formulation of a scheme or strategy to attain some specific accomplishment.
Purchasing
The act of buying /obtaining goods (services) by a health funding authority with money or by other means. In Iceland this is usually the Social Security system or hospitals.