Then she would discuss the major theories held by most experts.

Currently, there are two major theories of the brain's cognitive function.

There are currently two major theories about the development of pressure ulcers.

The year 1900 saw a major physical theory entered into the books and nothing has been quite the same since.

This goes against some major economic theories and is a bit of a mystery.

More recently two major new theories have been proposed.

It is a major theory of film study today.

There are two major theories as to how the disease develops.

Two major theories have been proposed to explain how this process of integration takes place.

The mechanism is difficult to understand but there are four major theories put forward.