THESE PROCEEDINGS WERE PREPARED FROM THE MOBILITY RESEARCH CONFERENCE HELD IN ROTTERDAM, THE NETHERLANDS, AUGUST 3-7, 1964. PROGRESS REPORTS ARE GIVEN ON THE FOLLOWING--(1) ULTRASONIC MOBILITY AID, (2) ULTRASONIC GUIDANCE SYSTEM, (3) ELEKTROFTALM MOBILITY AID, (4) PASSIVE ENVIRONMENT SENSORS, (5) AMBIENT-LIGHT OBJECT DETECTOR, (6) TRAVEL PATH SOUNDER, (7) PHONOSCOPE. PHOTOGRAPHS AND DIAGRAMS DESCRIBING EACH SYSTEM ACCOMPANY THE REPORTS. SPECIAL PROBLEMS AND TECHNIQUES CONNECTED WITH MOBILITY TRAINING, SUCH AS RETRAINING THE NEUROMUSCULAR SYSTEM TO FUNCTION WITH SENSES OTHER THAN VISION, TEACHING THE ART OF FENCING, THE USE OF SKIING AS A SPORT, AND THE IMPORTANCE OF GOOD HEARING ARE DISCUSSED. RESEARCH NEEDS ARE IDENTIFIED IN THESE AREAS--(1) THE HUMAN SKILLS NECESSARY FOR EFFECTIVE MOBILITY TRAINING, (2) THE DEVELOPMENT OF A READINESS TEST TO DETERMINE THOSE PERSONS WHO ARE READY FOR MOBILITY TRAINING, (3) MARKET RESEARCH REGARDING THE VARIOUS MOBILITY DEVICES. A SYSTEMATIC EVALUATION OF THE REAL UTILITY OF MOBILITY AIDS TO THE BLIND IS DISCUSSED AS A NECESSARY PREREQUISITE TO FUTURE DEVELOPMENT AND REFINEMENT OF ALL DEVICES. THE APPENDIX INCLUDES SPECIFICATIONS FOR THE LONG CANE, TECHNIQUES FOR TEACHING CANE TRAVEL, AND A FORM FOR EVALUATING MOBILITY TRAINING AND PERFORMANCE. REFERENCES ARE LISTED. (RS)