In sociology, quantitative research refers to the systematic empirical investigation of social phenomena via statistical, mathematical or computational techniques.

The report stated: "We accordingly recommend very strongly that no further investigation of reported mysterious aerial phenomena be undertaken, unless and until some material evidence becomes available."

The show features the group's investigations of alleged paranormal phenomena at reportedly haunted locations.

Isaac Newton's statement of the four rules revolutionized the investigation of phenomena.

His expertise in sleight-of-hand and magic tricks stood him in good stead for what would become his all consuming passion, the investigation of paranormal phenomena.

Systematic empirical investigation of quantitative properties and phenomena and their relationships.

Most of the mysteries involved investigation of baffling phenomena (e.g. an ancient Egyptian mummy that apparently whispered and a human skull that seemed to talk).

The new quantum mechanics became an indispensable tool in the investigation and explanation of phenomena at the atomic level.

Their mission being the investigation and containment of unexplained phenomena from around the world.

The show features investigations of alleged paranormal phenomena at various locations across the United States.