Fig. 3
From: An analysis of usability evaluation practices and contexts of use in wearable robotics
Progression of User Involvement with Technology Maturation. The number of users (target and mock) per Technology Readiness Level (TRL) are shown (n = 143). The size of the circles represents the number of responses within each TRL. For all respondents that only indicated testing with the one specific user group (target or mock), 0 users are shown in the opposite group. The Loess regression lines were fitted to smooth the scatter plot visualization