An economy based principally on the service sector would be inherently weak.

It is based principally on evidence from visits to 94 primary and 89 secondary schools in England between 2006 and 2009.

The economy was based principally on agriculture, craftmanship and the service industries.

Functioning of most psychiatric wards is principally based on medical model.

The paper will be based on research principally in government documents, private papers, and period newspapers.

Diagnosis is principally based on history and clinical signs.

But some of these estimates, based principally on antipathy for the Government, appeared to be high.

Its economy is principally based on the transportation, distribution, information technology, commercial, and retail sectors.

In the past the economy of the city was principally based on agriculture, but soon the population converted the rural village into an industrial center.

The following article is principally based on the account in Messori's book.