Term Definition
Quality
The degree to which product characteristics conform to requirements as agreed upon by producers and clients.
Quality assurance

A planned system of procedures, performance checks, quality audits, and corrective actions to ensure that the products produced throughout the survey lifecycle are of the highest achievable quality. Quality assurance planning involves identification of key indicators of quality used in quality assurance.

Quality audit
The process of the systematic examination of the quality system of an organization by an internal or external quality auditor or team. It assesses whether the quality management plan has clearly outlined quality assurance, quality control, corrective actions to be taken, etc., and whether they have been effectively carried out.
Quality checklist
A checklist for quality identifies all the steps, procedures, and controls specified to ensure required procedures have been followed and their goals met. An example of a Translation Quality Checklist is the ESS Round 7 Translation Quality Checklist (European Social Survey, 2014c).
Quality control
A planned system of process monitoring, verification, and analysis of indicators of quality, and updates to quality assurance procedures, to ensure that quality assurance works.
Quality management plan
A document that describes the quality system an organization will use, including quality assurance and quality control techniques and procedures, and requirements for documenting the results of those procedures, corrective actions taken, and process improvements made.
Quality profile
A comprehensive report prepared by producers of survey data that provides information data users need to assess the quality of the data.
Question-by-question objectives
Text associated with some questions in interviewer-administered surveys that provides information on the objectives of the questions.
Questionnaire adaptation
The deliberate technical or substantive modification of some feature of a question, response scales, or other part of a questionnaire to better fit a new socio-cultural context or particular target population (e.g., updating language: "radio" for "wireless", adapting an adult questionnaire for children: "tummy" for "stomach"; or tailoring for cultural needs: walk several blocks versus walk 100 yards).
Quota sampling
A non-probability sampling method that sets specific sample size quotas or target sample sizes for subclasses of the target population. The sample quotas are generally based on simple demographic characteristics (e.g., quotas for gender, age groups, and geographic region subclasses).