The phrase "assignment on behalf" is correct and usable in written English.
It can be used when referring to a task or duty that is being carried out for someone else or representing someone else's interests.
Example: "I am submitting this assignment on behalf of my colleague who is currently unavailable."
Alternatives: "task for" or "duty representing".
The Company Secretary must be informed if you are travelling to a war zone (or other high-risk assignment) on our behalf.
Not that she was doing a lot of classwork — according to the indictment, an unnamed American working with her completed most of her assignments on her behalf.
Meadows stolidly sums up his assignment: "I was to solicit — from a pacifist, on behalf of the military — the secret of weather forecasting".
The operating officer, which Mr. Bryant likened to a powerful city manager, would control the municipal budget and all personnel assignments and would have the power to sue on behalf of the city.
The effects of this are demonstrated in his first official assignment, which is to visit a newly arrived prostitute, Joyce Lakeland Jessica Albaa), on behalf of the town's moral majority and order her to get out of town before sundown.
Media portrayals also often refer to the 'essay' as the assignment being purchased, but in reality it applies to any sort of assignment; commercial services exist to write PhDs, or to sit exams on behalf of students.
His first assignment was valuing the portfolio of First Executive Life, an insurance company with ties to Drexel, on behalf of Apollo Group, an investment company run by another person from Drexel.
Any incorrect perception of the roles of the different criteria on behalf of the expert can consequently easily be conveyed into the assignment of weightings (Kritikos and Davies, 2011; Feizizadeh and Blaschke, 2013b).
The New York Times, a federal class-action suit filed on behalf of 550 women at The Times over inequities including pay, assignments and advancement.
WASHINGTON — Lanny J. Davis, a well-connected Washington lobbyist who had recently come under fire for his work on behalf of President Laurent Gbagbo of Ivory Coast, announced Wednesday that he would resign from the assignment.
