As I grow older and study the issues more I have become convinced the long term survival of a TEOTWAKI event will be found in a community approach. It will become necessary to draw together and function as communities composed of similarly minded individuals with a variety of skills to be able to provide a division of labor in order to have a reasonable lifestyle.
This has lead to a consideration of listing skills which would be essential to start, necessary over an extended period, and nice to have for the long haul. The selections will depend to some extent on where the community is located, its size, the resources, and surrounding communities, however their should be some commonalities. Another consideration will be the amount of disruption and the duration of disruption to the current infrastructure and distribution systems.
So how about a discussion of skills and ranking of importance. To start I would consider Blacksmithing not essential but necessary over an extended period. The ability to make and repair tools would be highly desirable. Some of the allied trades such as Fairer, Cutler, Gunsmith, etc. would probably be handled by the same person in smaller communities and until the demand justified specialization. Skills and the ability to concentrate on the work at hand brings along the requirement of other skills to support the efforts of the skilled trades. These support trades require their own skills and may or may not require full time work. Returning to the Blacksmith as an example he requires fuel for his forge which historically has been either coal or charcoal. In the past there were many "charcoal burners" who turned wood into charcoal. Some did it full time but others such as farmers did it in their off season, during the winter they would make charcoal to trade or sell. If coal deposits were available the support skills for it would involve mining and transport. Transportation needs wagon makers or boat builders, who need saw mills, and harness makers who need tanners, etc., etc.
What skills do you see in a community?