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The purpose of this study was to evaluate the feasibility of a new Web-based intermittent catheter self-management intervention.We tested the acceptability and usability of intervention components, which included multiple Web-based materials (an online urinary diary adapted for mobile phone use and an educational booklet), 3 phone calls with a nurse, and a peer-led discussion forum.Thirty adults with spinal cord injury using intermittent catheterization for bladder drainage were enrolled; 26 participants received the nurses' phone-based consultations.Preliminary effectiveness of new self-efficacy and self-management scales were evaluated using baseline and 3-month online surveys. Participants' perceived value of the intervention components, self-management changes, and suggestions were assessed with data from the 3-month surveys, followed by brief tape-recorded interviews.Several catheter practices improved somewhat over 3 months. The frequency of catheterizations every 4 to 6 hours increased from 71% to 77%. Self-management of neurogenic bladder dysfunction increased significantly (P = .032); participant comments indicated that fluid intake was the biggest change. Catheter-related self-efficacy and quality-of-life scores increased but not significantly. The frequency of urinary tract infection and pain did not change significantly. For feasibility, intervention components, with the exception of the forum, were rated highly by the majority of participants for usefulness, satisfaction (desired information), and Web-based usability.Further testing of this intervention is recommended in a multisite randomized clinical trial.