- option is both good and bad because some people actually don’t know but causes loss of data
- In general, want to avoid providing this  option



Question Response Option: Don't Know 

University of Michigan - Ann Arbor

Designing an effective survey is difficult because participants' answers can be unintentionally influenced by factors such as question wording, the order of items, and the available response options. These unintended influences can introduce statistical noise or create systematic biases that lead to misleading results. To maximize the reliability and validity of the data, researchers must apply specific construction principles to minimize these negative effects.

Survey Construction Challenges

Martin, Elizabeth K.(2005). Survey Questionnaire Construction.
3-s2.0-B0123693985004333-main.pdf

Survey Questionnaire Construction

- Even changing one word can have a trigger different responses
- Should avoid ambiguity, but it’s near impossible to because people interpret every single word differently. 
- Ambiguity can come from having “contradictory grammatical and semantic elements” and can cause cognitive overload, therefore respondent doesn’t answer question fully or misinterprets


Question Wording

- Open-ended questions
- Close-ended questions 

Response Categories & Scales

Providing Other Response Options

An item-order effect occurs in survey research when the specific sequence in which questions are presented unintentionally influences how participants respond. Earlier items can alter a respondent's interpretation of subsequent questions or prime certain information in their memory, creating a context bias. Researchers often randomize or counterbalance the presentation of items to mitigate this effect.

Item-Order Effect

In survey research, context effects are unintended influences on a respondent's answers that arise not from the specific content of the question itself, but from the surrounding context in which the item is presented. These biases can occur when previous questions, response options, or the overall survey format alter a participant's interpretation of an item or the information they retrieve from memory.

Survey Context Effects

Survey formatting is the structural organization of a questionnaire designed to maintain respondent engagement and minimize fatigue. Beyond simply writing clear items, effective formatting involves crafting an introduction to secure informed consent, providing explicit instructions with examples, and strategically sequencing the items. Best practices include placing the most critical questions early in the survey, grouping similar items together, reserving demographic questions for the end, and always concluding with an expression of appreciation to the respondent.

Survey Formatting

Survey item order refers to the strategic sequencing of questions to maximize respondent engagement and minimize fatigue. Because participants are most attentive and least fatigued at the beginning of the survey (immediately following the introduction), researchers should place the most important substantive items early on and position less critical items later in the questionnaire.

Learn Before

Related

Learn After