Secondary research already exists since it has been collected for other purposes.

But while most agree that early and intense therapy is good for autistic children, until recently, little research on intervention methods existed.

Very little direct environmental research or observation of tidal stream systems exists.

What little research existed had shown these to be ubiquitous urban pollutants with potential negative health effects.

Scant research exists, the experts said, since the number of cases is not large enough to provide meaningful data.

Very little research exists on ethnic elders in Britain.

Because sleep disorders are relatively new as a medical specialty, little research exists.

In addition, little research exists on custody evaluation and the long-term results for the child.

Recent research, however, points to the possibility that Morelly never actually existed but was, rather, a pseudonym.

Even theoretical research on the effects of emissions trading exists in name only.