Pretesting, pilot testing, or field-testing

Discuss the usefulness of pretesting, pilot testing, or field-testing a survey or interview questionnaire.
In some large-scale research projects the researcher is not always the one collecting data but is more heavily involved in the analysis and interpretation of the data. Would this create a challenge in a quantitative study where a survey was used for data collection? Would this scenario create a challenge in a qualitative study where a one-to one interview or focus group data collection method was used? Explain why or why not for both scenarios.