Relates to the extent to which an evaluation method my be relied upon in terms of repeatability and prediction. The data analyst will be checking for random error for in order to determine the extent of accuracy of Precision of the method being assessed.

“Reliability has to do with the quality of measurement. In its everyday sense, Reliability is the “Consistency” or “repeatability” of your measures.” -William M.K. Trochim

“All that Internal validity means is that you have evidence that what you did in the study (i.e., the program) caused what you observed (i.e., the outcome) to happen. It doesn’t tell you whether what you did for the program was what you wanted to do or whether what you observed was what you wanted to observe — those are construct validity concerns”. -William M.K. Trochim

a host of distinctly different ways of thinking about, adopting values of focus to and conducting an evaluation.

Justifiable by argument and I would add and in terms of the causal relationship  expectations of beneficiaries and other key stakeholders.

The program, project, organization, policy or system that is the subject of the evaluation (The term is not usually used to refer to a person).

a host of distinctly different ways of thinking about, adopting values of focus to and conducting an evaluation.