The goal of this study was to determine whether the Revised NIOSH Lifting Equation (RNLE) CD-ROM training program, when used without an instructor, could adequately train RNLE users to properly understand and correctly apply the RNLE. If so, then it can be used to fill a current gap in delivering training to both health and safety professionals, and RNLE end-users that do not have access to instructors or traditional classroom training. Combinations of different training methods (computer-based via CD-ROM versus text-based, and instructor directed versus self-directed/self study) were evaluated as to their effectiveness in enhancing knowledge and skills regarding the proper use of the RNLE. Participants were assigned by classroom units to one of four different instructional groups: instructor led using CD-ROM, self study using CD-ROM training, instructor led using printed text, and self study using printed text. The effectiveness of the training was evaluated using written pre and post-training tests to determine the relative quality and appropriateness of the training materials and their delivery methods. Of particular interest was the performance of the self study using CD-ROM training group compared to both the self study using printed text and the instructor-led using text groups. The CD-ROM self study (without an instructor) was found to be significantly more effective than both the self study using printed text and the instructor-led using text with regards to training in the correct and accurate use of the Revised NIOSH Lifting Equation. [The dissertation citations contained here are published with the permission of ProQuest LLC. Further reproduction is prohibited without permission. Copies of dissertations may be obtained by Telephone (800) 1-800-521-0600. Web page: http://www.proquest.com/en-US/products/dissertations/individuals.shtml.]