What it is
People perceive a single unit as the proper portion, regardless of actual size.
How it shows up in CX
Customers tend to consume or complete a task based on unit size rather than actual need.
CX pillars it strengthens
ExpectationsEffortConvenience
How to design with it
1
Optimize portion sizes.
2
Adjust packaging and serving sizes to influence consumption.
3
Guide completion behavior.
4
Break up tasks or rewards into meaningful units.
5
Balance perception.
6
Ensure unit sizing aligns with user expectations.
Supporting biases
Framing EffectDefault Effect
Opposing biases
Proportional JudgmentNeed-Based Scaling
Related biases
Behavioral Biases
Design with behavior, not against it.
Explore more biases, or work with us to apply behavioral science to your customer experience.