iScale

Method suitability

Study type

Field studies
XLab studies
XOnline studies
Questionnaire

Development phase

Concepts
Early prototypes
Functional prototypes
XProducts on market

Studied period of experience

Before usage
Snapshots
An episode
XLong-term UX

Evaluator / Info provider

UX experts
XOne user at a time
Groups of users
Pairs of users

Data

XQualitative
XQuantitative

Applications

XWeb services
XPC software
XMobile software
XHardware designs
Other:

Requirements

Trained researcher
XSpecial equipment

Summary

iScale is a survey tool for the retrospective elicitation of longitudinal user experience data.

Description

The participant draws one or more curves to describe how the experience about a product has changed over time. The curve drawing area is formed of a timeline and a horizontal line that divides positive and negative experiences. UX Curve, described elsewhere in this methods set, is a similar pen-and-paper method.

Strengths

Helps to reveal the most impactful experiences over time

Weaknesses

Counting on memories rather than reality

References describing the method

Karapanos, E., Martens, J.-B., Hassenzahl, M. (2009) Reconstructing Experiences through Sketching. CoRR abs/0912.5343. (Submitted to ACM TOCHI)

References about quality of the method

Karapanos, E., Martens, J.-B., Hassenzahl, M. (2010) On the Retrospective Assessment of Users' Experiences Over Time: Memory or Actuality?. CHI'10 extended abstracts on Human factors in computing systems. Atlanta, ACM Press.

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