Define deeper question timing

Docs/KnowledgeAndSkillFoundation.md

@@ -473,3 +473,39 @@ feedback: Fiber is a basic binding material for primitive crafting and shelter.
 
 Question-bank rule: elementary questions should be short, practical, and tied to
 actions the player can immediately recognize in the MVP.
+
+## When Deeper Questions Matter
+
+Deeper questions should not decide whether a new player can survive the first
+night. They should matter when the player is trying to do better, teach others,
+or enter more complex branches.
+
+Quality improvements:
+
+- Use deeper checks when the player wants better yield, stronger construction,
+  more durable tools, safer food, better medicine, or more efficient work.
+
+Safer work:
+
+- Use deeper checks when incorrect assumptions could create fire spread, injury,
+  sickness, structural failure, bad weather exposure, or wasted scarce supplies.
+
+Complex crafting:
+
+- Use deeper checks for multi-stage recipes, material substitutions, tool
+  maintenance, preserved food, medicines, buildings, and later machinery.
+
+Teaching others:
+
+- Use deeper checks when a player or NPC attempts to teach a concept, create a
+  lesson note, train family/community members, or evaluate whether someone
+  understood a dangerous task.
+
+Advanced branches:
+
+- Use deeper checks for farming, animal care, medicine, engineering, trade,
+  navigation, governance, science, and future advanced technology.
+
+Depth rule: deeper questions should improve mastery and responsibility. They
+should not be busywork for actions the character has already demonstrated
+through repeated safe practice.