However the structure of "family tree" relationships within the Chelicerata has been controversial ever since the late 19th century.

The Indian space program has been controversial since its inception in the 1950's.

The classification within the family Veneridae has been controversial at least since the 1930s.

Its age has been controversial since the 1870s, when many people thought it was only a few decades old.

The decision to destroy such an important building of Canberra's heritage was controversial at the time and since.

It is an area of study in psychology and has been controversial since its beginning.

The relief had been very controversial ever since the presentation of the project in 1886.

The book and its title have been controversial since its publication.

But the accounts have been controversial since their introduction in January 2004.

The program has been controversial since the day the concept was announced more than two years ago.