The validity of the assessment to which the subject of measurement is measured, whereby it is not the same as reliability. Validity is an indicator of how good your measurement is, it relates to the design and methods of your research. Validity of data collection means that your views really represent what you claim to measure. When it comes to this, how well a measurement (experiment) is done, especially if it avoids confusion, Internal validity is representative. The smaller the chance of confusion, the greater the internal validity.
The answer is: internal validity.
