Experiments were based on systematic observation of rats fed a 50% galactose diet.

Smith was known for his many systematic recorded observations on nature and topography.

This belief led the priests to make careful and systematic observations of the heavenly bodies.

Science was about discipline; about systematic observation, experiment and measurement.

Usability testing usually involves systematic observation under controlled conditions to determine how well people can use the product.

It is therefore essential that you are able to note these by systematic observation.

"Any systematic observation of a speaker defines a formal context where more than the minimum attention is paid to speech."

Information is collected on the battlefield through systematic observation by deployed soldiers and a variety of electronic sensors.

The best data available come from a study based on systematic, on-the-ground observation.

He was the first to establish stations in the United States for the systematic observation of earthquake phenomena.