diff --git a/app/data/dataFileNames.json b/app/data/dataFileNames.json
index 467fdd0..96ecfbf 100644
--- a/app/data/dataFileNames.json
+++ b/app/data/dataFileNames.json
@@ -1 +1 @@
-{"main":"firstModule.json","others":["RfEsZpNK.791f2cda554d18a95fc3734bbe65f88b.json","sArkxak3.bda40d280ffd6baa48d38117905bd5ab.json","2qVqSwId.6c0be3e0610de0d44ac1b294da16d4fd.json","vQrgRbIS.80594ce9bebcfa2809538046c647dde3.json","U77gcZNf.8857dc7179e0813487e12b85611b3b9b.json","RqGMsFtz.aeed2715e184fe51657af9db9ba6f965.json"]}
\ No newline at end of file
+{"main":"firstModule.json","others":["RfEsZpNK.791f2cda554d18a95fc3734bbe65f88b.json","sArkxak3.bda40d280ffd6baa48d38117905bd5ab.json","2qVqSwId.b86995173d611d4e9c0524bce3ecf6e5.json","vQrgRbIS.80594ce9bebcfa2809538046c647dde3.json","U77gcZNf.8857dc7179e0813487e12b85611b3b9b.json","RqGMsFtz.aeed2715e184fe51657af9db9ba6f965.json"]}
\ No newline at end of file
diff --git a/app/data/store.js b/app/data/store.js
index 8996ae7..16ed5a9 100644
--- a/app/data/store.js
+++ b/app/data/store.js
@@ -27,6 +27,7 @@ import {
   ANALYTICS_STRINGS,
   EVENTS,
   SCORES,
+  INHERITED_KEYS,
 } from '../utils/constants';
 import logTiming from '../utils/logTiming';
 
@@ -99,6 +100,14 @@ const store = {
     });
   },
 
+  computeInheritRule(newScoreKey, oldScoreKey) {
+    if (INHERITED_KEYS.includes(newScoreKey)) {
+      return [(item) => true, newScoreKey];
+    } else if (INHERITED_KEYS.includes(oldScoreKey)) {
+      return [(item) => item.scoreKey === oldScoreKey, SCORES.LEVEL_0.key];
+    }
+  },
+
   getItem(idOrItem) {
     if (typeof idOrItem === `string`) {
       return this.itemCache[idOrItem];
@@ -197,20 +206,25 @@ const store = {
 
     Object.assign(item, data); // gasp, mutability
 
+    if (saveToDisk) {
+      diskStore.setItem(item.id, data);
+    }
+
     if (!updateDom) return;
 
     const nextItemState = serializeItemState(item);
+    this.updateItemDom(item, prevItemState !== nextItemState, scoreChanged, options);
+  },
 
+  updateItemDom(item, renderItem, renderScore, options = {}) {
     // potentially trigger a re-render of the item
-    if (item.visible && prevItemState !== nextItemState) {
+    if (item.visible && renderItem) {
       this.triggerListener(item.id); // TODO (davidg): `ROW-${item.id}`
     }
 
     // potentially trigger a re-render of the score bar
-    if (scoreChanged) {
-      if (saveToDisk) diskStore.setItem(item.id, data);
-
-      if (this.selectedItem && this.selectedItem.id === idOrItem.id) {
+    if (renderScore) {
+      if (this.selectedItem && this.selectedItem.id === item.id) {
         this.triggerListener(EVENTS.SCORE_CHANGED); // updates the score bar
       }
     }
@@ -221,15 +235,56 @@ const store = {
     if (!item) return;
     const updateDom = (typeof options.updateDom !== `undefined`) ? options.updateDom : true;
 
+    const oldScoreKey = item.scoreKey;
+
     // caution: update the score summary before updating the item
-    const updatedItems = this.updateScoreSummary(item, scoreKey, item.scoreKey);
+    const updatedItems = this.updateScoreSummary(item, scoreKey, oldScoreKey);
 
     this.updateItem(item, { scoreKey }, options);
 
+    const inheritRule = this.computeInheritRule(scoreKey, oldScoreKey);
+
+    if (inheritRule) {
+      const dirtyChildren = [];
+
+      const updateChildren = (parent, test) => {
+        const children = this.getChildrenOf(parent.id);
+        if (!children) return;
+
+        children.forEach((child) => {
+          if (test(child)) {
+            dirtyChildren.push(child);
+          }
+
+          updateChildren(child, test);
+        });
+      };
+
+      updateChildren(item, inheritRule[0]);
+
+      const optionsNoDom = Object.assign({}, options);
+      optionsNoDom.updateDom = false;
+
+      const updateChild = (child) => {
+        this.updateItem(child, { scoreKey: inheritRule[1] }, optionsNoDom);
+      };
+      const updateChildDom = (child) => {
+        this.updateItemDom(child, true, true, options);
+      };
+
+      dirtyChildren.forEach(updateChild);
+
+      const visibleChildren = dirtyChildren.filter((child) => child.visible);
+      visibleChildren.forEach(updateChildDom);
+    }
+
     if (updateDom) {
-      updatedItems.forEach((updatedItem) => {
+      const updateItem = (updatedItem) => {
         this.triggerListener(`PIE-${updatedItem.id}`);
-      });
+      };
+
+      const visibleItems = updatedItems.filter((item) => item.visible);
+      visibleItems.forEach(updateItem);
     }
   },
 
@@ -241,23 +296,56 @@ const store = {
     oldScoreKey = oldScoreKey || SCORES.LEVEL_0.key;
     const updatedItems = [];
 
-    const updateParentScore = (child) => {
-      const parent = this.getParent(child);
-      if (!parent) return; // we're at the top
+    const updateSummary = (parent, inheritRule) => {
+      const children = this.getChildrenOf(parent.id);
+      if (!children) return; // we're at the bottom
       updatedItems.push(parent);
 
       this.scoreSummary[parent.id] = this.scoreSummary[parent.id] || {};
-      this.scoreSummary[parent.id][newScoreKey] = this.scoreSummary[parent.id][newScoreKey] || 0;
-      this.scoreSummary[parent.id][newScoreKey] += 1;
+      Object.keys(SCORES).forEach((scoreKey) => {
+        this.scoreSummary[parent.id][scoreKey] = children
+        .map((child) => {
+          this.scoreSummary[child.id] = this.scoreSummary[child.id] || {};
+          const scoreSummary = this.scoreSummary[child.id][scoreKey] || 0;
+          let newValue = child.scoreKey || SCORES.LEVEL_0.key;
+
+          if (child === item) {
+            newValue = newScoreKey;
+          } else if (inheritRule) {
+            if (inheritRule[0](child)) {
+              newValue = inheritRule[1];
+            }
+          }
+
+          return newValue === scoreKey ? scoreSummary + 1 : scoreSummary;
+        })
+        .reduce((a, b) => a + b, 0);
+      });
+    };
+    const updateChildrenScore = (parent, inheritRule) => {
+      const children = this.getChildrenOf(parent.id);
+      if (!children) return; // we're at the bottom
 
-      if (!newItem) {
-        this.scoreSummary[parent.id][oldScoreKey] -= 1;
-      }
+      children.forEach((child) => {
+        updateChildrenScore(child, inheritRule);
+      });
+
+      updateSummary(parent, inheritRule);
+    };
+    const updateParentScore = (child) => {
+      const parent = this.getParent(child);
+      if (!parent) return; // we're at the top
 
+      updateSummary(parent);
       updateParentScore(parent);
     };
 
-    // we don't update the item directly, only its ancestors
+    const inheritRule = this.computeInheritRule(newScoreKey, oldScoreKey);
+
+    if (inheritRule) {
+      updateChildrenScore(item, inheritRule);
+    }
+
     updateParentScore(item);
 
     return updatedItems;
diff --git a/app/utils/constants.js b/app/utils/constants.js
index 593753b..5b9ff56 100644
--- a/app/utils/constants.js
+++ b/app/utils/constants.js
@@ -131,6 +131,8 @@ export const SCORES = {
   },
 };
 
+export const INHERITED_KEYS = [SCORES.LEVEL_1.key, SCORES.LEVEL_4.key];
+
 export const KEYS = {
   DOWN: 40,
   ENTER: 13,