A single military specification for Human Factors does not exist at this time. Many standards and specifications which cover various parts of the field were reviewed. The Electronic Industries Association has prepared a proposed specification on Human Factors which encompasses all aspects of the field, and is applicable to the entire weapon system spectrum. Methods of interpretating existing standards for utilization by design engineers has been accomplished through the development of Human Factors Guides. The factor that may have greatest influence on the effectiveness of Human Factors specification is the shift from fixed fee contracting to incentive contracting.