Recent years have witnessed numerous expert-driven projects to set forth the law. Examples include the International Committee of the Red Cross’s Customary International Humanitarian Law Study, its Interpretive Guidance on the Notion of Direct Participation in Hostilities, and International Manuals on such subjects as the law relating to armed conflicts at sea, the International Law relating to Air and Missile Warfare and Cyber Warfare. Appreciating that the ICRC texts were not produced or described as Manuals, all of the listed texts reflect expert interpretation of fragmented, obscure or as yet unarticulated law. Chapter 3 takes each of the listed texts in turn, looks at the status in law that they claim and seem to have, notes the importance of each, given the complexities and gaps in the treaty law of armed conflict that we currently have and reflects on whether the generation of such Manuals is a desirable development.