A real concern about "tracking" arises when it is impossible for a child who is placed in a lower track to move to a higher track in later years. There should be at least yearly opportunities to "jump the tracks". Maybe "ability grouping" or "placement by achievement" are better terms to use, although many school officials will oppose ability grouping no matter what it is called.

"To see what is in front of one's nose needs a constant struggle." - George Orwell