Internal Validity is” the approximate truth about inferences regarding cause-effect or causal relationships” (Trochim, 2016). Internal validity is considered at the time of the investigation that measures the results of social programs or interventions. Internal validity observes positive and negative results in order to improve or eliminate services. Therefore, it means that evaluators’ investigation help them to observe the outcomes to happen (Trochim, 2016).
Casual validity is the secret of success in internal validity. Internal validity consists in threats or the type of criticisms evaluators obtain when they study the program outcomes. Threats to validity have three classifications. First, single group threats refer to the criticism, when evaluators study a group that receives the program. Second, multiple groups threats involve criticism regarding several groups in the investigation. Third, social threats to internal validity discuss social research …show more content…
Single group threats and multiple group threats would not benefit Nurse Family Partnership program outcomes. These threats are designed to search other program aspects such as the comparison of many groups. Social threats to internal validity investigation provide alternate information about program success and failure. It gives the opportunity to evaluators to select the best explanation for the program outcomes as well as to adapt new aims to future