But his theory lacked conclusive proofs, and it was discarded.

But outside of that one feature, Cardona's theory lacked merit.

But from the beginning, Dr. Wilson concedes, the theory lacked substantive scientific evidence that it worked.

Others argued that her theories lacked an understanding of financial power.

This was no easy task, as contemporary grammatical theory lacked the rich and precise terminology to describe such values.

Although some difficulties of the theory can be cured, the theory "lacks a solid foundation" and "has not led to any new concrete result".

This theory lacks consideration of culture and its influence on personality.

Bagley also believed the dominant theories of education of the time were weak and lacking.

Presently, sociological theories lack a single overarching foundation, and there is little consensus about what such a framework should consist of.

The theory lacks an explanation for how a creative individual chooses the input spaces that should be blended to generate a desired result.