Dr. tong is trying to define 'life satisfaction' and to create a test that will assess the level of a person's satisfaction with their life. she is planning to find out how well her test correlates with other tests believed to measure life satisfaction. this is an example of

This is an example of convergence evidence.
Convergence evidence refers to the type of evidence that derives from independent sources that couldn't be objectively measured by the researcher.
In the case above, the data about the satisfaction came from the subject's personal evaluation and experiences