Desired behaviour by the controller that will have an impact on the aircraft trajectory. The controller intent may not be entirely observable or quantifiable. For example, a controller may vector an aircraft by assigning a heading, the controller intent includes a turn-back, but the precise magnitude and timing of that manoeuvre may not be known a priori.
SESAR Concept of Operations Step 2 Edition 2014 (Ed. 01.01.00)
Lexicon Release 2015.1