Measurement validity primarily relates to:

Measurement validity relates primarily to quantitative research, where concepts are operationalised into measurable indicators.

Qualitative research emphasises trustworthiness criteria rather than measurement validity as such.

Interpretivism is an epistemological stance about understanding meaning, not a measurement concern.

Constructionism is an ontological position about socially constructed reality, again not measurement validity.

Measurement validity asks whether an indicator truly captures the concept it claims to measure.

It is closely tied to reliability, since a valid measure must first be consistent.