Two researchers investigating a problem using different research techniques obtain similar results. What do their measurements show?

Similar results from different research techniques indicate convergent validity of the measurements.

Convergent validity is shown when measures that should relate to one another actually do.

Inter-rater validity instead concerns agreement between different observers using the same measure.

Construct validity is the broader question of whether a measure captures its theoretical concept.

Test-retest validity concerns stability of the same measure across two points in time.

Convergence across independent methods is the logic underlying triangulation.