iScale: Studying Long-Term Experiences through Memory - Modeling Users' Experiences with Interactive Systems - page 101

Mode of recall

Constructive Value-Account Control

Ease of use A B C

Innovativeness D E F

Fig. 5.5 Study design

5.4.1.4 Procedure

Participants joined two sessions, each one lasting approximately 40 minutes and
separated by approximately one week (minimum: 7 days, maximum: 10 days). Dur-
ing the first session, participants used two different tools (either of the two graphing
versions of iScale and the no-graphing version) to report on two qualities of their
mobile phones (see section 5.3.1.2 for a motivation of the chosen product qualities).
For instance, participants in condition 1 (see figure 5.6) used the constructive iScale
to report on ease of use, followed by the no-graphing tool to report on innovative-
ness. During the second session, participants used the same combinations of tool -
product quality, but in reverse order (see figure 5.6). As such, participants' consis-
tency across those two sessions could be used a measure of test-retest consistency
of the recall process.

1st session 2nd session

F A

1 A 1 F

2 F A 2 A F

3 D C 3 C D

4 C D 4 D C

7-10 days

F B

5 B 5 F

6 F B 6 B F

7 E C 7 C E

8 C E 8 E C

Fig. 5.6 Study procedure. Participants joined two sessions. In each session they used two dif-
ferent tools to report on two different product qualities. Tasks A to F refer to the six conditions
of the study design (see figure 5.5).