The phrase "worked upon" is correct and usable in written English.
It can be used to indicate that something has been the subject of effort or attention.
Example: "The project was worked upon by several teams over the course of six months."
Alternatives: "worked on" or "addressed".
"If worked upon well this model can significantly address the crime figures in India," said Mr. Yashovardhan Azad, the Secretary of Security, for the government of India.
There is much here that could be worked upon, as it is in Germany and Sweden, where woodland is much more part of the life of the people it surrounds.
The craftsperson must maintain control of the center area or the structure unravels: most sprang worked upon has too many fibers to keep in hand, so rods or sticks maintain the appropriate fiber positions.
That dynamic needs to be worked upon".
As I said, these things were being and worked upon for quite some time.
Mutations and natural selection, however, would presumably have worked upon each part of such a system individually.
Perhaps the one title worked upon with a look into the future when made, this game suits the Xbox One.
It was at the Royal Military Academy in Woolwich that Walter George, an international miler, worked upon Rampling's track enthusiasm.
But the really serious hardship will be worked upon the residents of St. David's Island, who are extremely poor and cannot even imagine living in any other place.
Justinian is but one example of the civilizing magic that Constantinople often worked upon the heirs of those who ventured within its walls.
But the really serious hardship will be worked upon the residents of St. David's Island, who are extremely poor &cannot even imagine living in any otherplace.
