What is Stapel Scale?
The Stapel scale is a rating scale that asks respondents to evaluate a single adjective or attribute by selecting a numeric value (often ranging from negative to positive). It presents one word per item and a row of numbers for respondents to indicate how strongly the adjective applies.
A Stapel scale measures the strength and direction of an attitude toward a single attribute by pairing a single descriptive word (for example, “reliable” or “clear”) with a numerical scale. Respondents pick a number that indicates how strongly they feel the adjective applies to the object (product, service, statement, etc.). The numeric range commonly runs from a negative value to a positive value (for example −3 to +3 or −5 to +5), though variants use positive-only ranges. Unlike a semantic differential (which uses opposing adjective pairs) or a Likert statement (which asks agreement with a sentence), the Stapel scale is compact and item-focused: one adjective, one row of numbers. Because it relies on a single word per item, wording and translation must be handled carefully to avoid ambiguity.
Usage example
You want to measure parents’ impressions of school communications. For each attribute you show a single word and a numeric row: “Clear” [−3 −2 −1 0 +1 +2 +3]. A parent who thinks communications are mostly clear chooses +2. In a multilingual Hearo survey you provide the adjective translated for each language; parents answer in their preferred language while admins view results aggregated and translated back for analysis.
Practical application
Why it matters: The Stapel scale is useful when you need to measure how strongly many attributes apply while keeping the survey compact — for example brand/image checks, service attribute ratings, or quick usability checks. It works well on mobile and when screen space is limited because each item needs only one short adjective instead of two opposing phrases or a full statement. For multilingual surveys it can reduce translation volume (single word per item), but it raises practical concerns: a single adjective may not carry the same nuance in every language, and negative number conventions can confuse some respondents. In Hearo-style workflows, use careful translation, pilot items with target communities, provide clear numeric labels or tooltips, and offer a feedback flag so participants can report wording that doesn’t make sense in their language.
FAQ
How is the Stapel scale different from a Likert scale?
A Stapel scale presents one adjective with a numeric range (often negative to positive) and asks how much that adjective applies. A Likert scale presents a statement and asks how much a respondent agrees or disagrees with it. Stapel is more compact and attribute-focused; Likert is often clearer for statements and easier for low-literacy respondents.
When should I choose a Stapel scale?
Use a Stapel scale when you need to rate many attributes quickly and want to save space (for example, on mobile) or when you’re testing perceptions of specific adjectives. Avoid it when respondents may struggle with numerical ranges, when translation nuance is critical, or when you need clearly worded statements for legal/consent text.
Can I use the Stapel scale in multilingual surveys?
Yes, but be cautious. Because each item relies on a single adjective, translation must preserve the same nuance across languages. Test translations with target communities, consider adding brief clarifying tooltips or labels for the numeric points, and use participant feedback to refine wording — a workflow Hearo supports.
How should I analyze Stapel-scale responses?
Treat the numbers as interval data for most reporting: compute means, standard deviations, and group comparisons. Positive values indicate favorable association with the adjective; negative values indicate unfavorable. Watch for central-tendency bias and differences in how cultures use numeric scales, and consider segment-level checks to ensure comparisons across languages are valid.