Passage Summary: Vincent says you can't study happiness scientifically because you can't measure it, but Yolanda thinks you can because it's just like eye doctors asking patients what they see.

Reasoning: Vincent believes happiness is outside the realm of science because it is subjective; Yolanda argues that because other sciences use subjective reports, happiness can be studied scientifically.

Analysis: To find the point at issue, we look for the statement where one person says 'yes' and the other says 'no.' Vincent claims happiness cannot be measured and thus cannot be a scientific discipline, while Yolanda's analogy to optometry implies that happiness can be studied scientifically through subjective reports. The core of their disagreement is whether happiness can be a subject of legitimate scientific study. Vincent would say 'no' to this, while Yolanda would say 'yes.'