Having read several books about the western front during World War I, the [universal] consensus of authors I have read is that the safety and habitability of German trench system was demonstrably superior to all allied systems. But nowhere have I been able to find out why this consensus exists, or why German trench system was superior - if, in fact it was.

Since I make the assumption that the German system was superior, can anyone provide information, including sources if possible, how the Germans built their trench system that provided improved safety and comfort for its infantry?

Common military consensus, the other guy's stuff is always better.

Grizz

In true Teutonic form, they built them to last; concrete quarters, solid wood structures, + superior sanitary facilities. My great uncle was in the AEF + when young he told some stories of life in the trenches; wish had told more. He was impressed by their efficiency. As true then as it always has been the Germans took war seriously while the English treated it like sport. For reading material on the subject, you might wish to read the reminiscences of Eric Von Ludendorff.