What would be an ideal number of six-digit codes? Maybe five or six? Humanitarian Engineering Design, Appropriate Technology Development, Assistive Technology, Inclusive Design, and Human Factors could be merged in "Design Paradigms and Methods" (or something along these lines) Emergency response and Disaster Management into one category, not sure the name for it, maybe Disaster Response and Management? Maybe HE Education and capacity building and training into Education and Training? Maybe another code could be Policies and Ethical Standards or something along those lines?