diff --git a/src/reducers/stateReducer.features.test.js b/src/reducers/stateReducer.features.test.js
index 6256095..eba1bd0 100644
--- a/src/reducers/stateReducer.features.test.js
+++ b/src/reducers/stateReducer.features.test.js
@@ -1,14 +1,20 @@
 import {stateReducer} from './stateReducer';
 
 describe('Features', () => {
-  const state = {
-    features: [
-      'low', 'high','back', 'rounded', 'sonorant', 
-      'nasal', 'obstruent', 'occlusive', 'plosive', 
-      'prenasalized', 'aspirated', 'coronal'
-    ]
-  };
-  
+  const state = {}
+  beforeEach(() => {
+    state.phones = {
+      a: {features: {occlusive: true}, grapheme: 'a'},
+      n: {features: {occlusive: false}, grapheme: 'n'}
+    };
+    state.features = {
+        occlusive: {
+          positive: [state.phones.n],
+          negative: [state.phones.a]
+        }
+    };
+  });
+
   it('features returned unaltered', () => {
     const action = {type: ''};
     expect(stateReducer(state, action)).toBe(state);
@@ -16,7 +22,13 @@ describe('Features', () => {
 
   it('feature addition returns new feature list', () => {
     const action = {type: 'ADD_FEATURE', value: {feature: 'anterior'}};
-    expect(stateReducer(state, action)).toEqual({...state, features:[...state.features, action.value.feature]})
-  })
+    expect(stateReducer(state, action)).toEqual(
+      {...state, 
+        features:{...state.features, 
+          anterior:{ positive:[], negative:[] }
+        }
+      }
+    );
+  });
 
 });
\ No newline at end of file
diff --git a/src/reducers/stateReducer.js b/src/reducers/stateReducer.js
index 80888ee..1987b4d 100644
--- a/src/reducers/stateReducer.js
+++ b/src/reducers/stateReducer.js
@@ -5,15 +5,24 @@ const initState = () => {
 }
 
 const addPhones = (phones, phone) => {
-  let node = {}
+  let node = {};
   phone.split('').forEach((graph, index) => {
     if (index) node[graph] = {}
     if (!index && !phones[graph]) phones[graph] = {} 
     node = index === 0 ? phones[graph] : node[graph];
+    if (index === phone.length - 1) node.grapheme = phone;
   })
   return phones;
 }
 
+const findPhone = (phones, phone) => {
+  let node;
+  phone.split('').forEach((graph, index) => {
+    node = index === 0 ? phones[graph] : node[graph];
+  });
+  return node;
+}
+
 const addFeatureToPhone = (phones, phone, featureKey, featureValue) => {
   let node = {}
   phone.split('').forEach((graph, index) => {
@@ -44,20 +53,38 @@ const stateReducer = (state, action) => {
     }
 
     case 'ADD_FEATURE': {
-      let newFeature = action.value.feature;
       let positivePhones = action.value.positivePhones || [];
       let negativePhones = action.value.negativePhones || [];
+      let newFeatureName = action.value.feature;
       
       let newPhoneObject = [
         ...positivePhones, ...negativePhones
       ].reduce((phoneObject, phone) => addPhones(phoneObject, phone), state.phones)
-      if (positivePhones) positivePhones = positivePhones.reduce(
-        (phoneObject, positivePhone) => addFeatureToPhone(phoneObject, positivePhone, newFeature, true)
-        , newPhoneObject);
-      if (negativePhones) negativePhones = negativePhones.reduce(
-        (phoneObject, positivePhone) => addFeatureToPhone(phoneObject, positivePhone, newFeature, false)
-        , newPhoneObject);
-      return {...state, features:[...state.features, newFeature], phones: newPhoneObject}
+      
+      if (positivePhones) {
+
+        positivePhones.reduce(
+          (phoneObject, positivePhone) => addFeatureToPhone(phoneObject, positivePhone, newFeatureName, true)
+          , newPhoneObject
+        );
+
+        positivePhones = positivePhones.map( positivePhone => findPhone(newPhoneObject, positivePhone) )
+        // console.log(positivePhones)
+      }
+      
+      if (negativePhones) {
+        
+        negativePhones.reduce(
+          (phoneObject, positivePhone) => addFeatureToPhone(phoneObject, positivePhone, newFeatureName, false)
+          , newPhoneObject
+          );
+          
+        negativePhones = negativePhones.map( negativePhone => findPhone(newPhoneObject, negativePhone) )
+        // console.log(negativePhones)
+      }
+      
+      let newFeature = {[action.value.feature]: {positive: positivePhones, negative: negativePhones}};
+      return {...state, features:{...state.features, ...newFeature}, phones: newPhoneObject}
     }
 
     default:
diff --git a/src/reducers/stateReducer.phones.test.js b/src/reducers/stateReducer.phones.test.js
index 42990ec..fc3e638 100644
--- a/src/reducers/stateReducer.phones.test.js
+++ b/src/reducers/stateReducer.phones.test.js
@@ -1,17 +1,16 @@
 import {stateReducer} from './stateReducer';
 
 describe('Phones', () => {
-  const n_phone = {features: {nasal: true}}
-  const state = {
-    features: [
-      'nasal'
-    ],
-    phones: { n: n_phone }
-  };
-
+  const n_phone = {features: {nasal: true}, grapheme: 'n'};
+  const state = {};
   beforeEach(()=> {
-    state.features = [ 'nasal' ];
     state.phones= { n: n_phone };
+    state.features = {
+      nasal: {
+        positive: [state.phones.n],
+        negative: []
+      }
+    };
   })
 
   it('phones returned unaltered', () => {
@@ -23,7 +22,7 @@ describe('Phones', () => {
     const action = {type: 'ADD_FEATURE', value: {feature: 'anterior', positivePhones: ['n']}};
     expect(stateReducer(state, action)).toEqual(
       {...state, 
-        features:[...state.features, action.value.feature],
+        features:{...state.features, anterior: { positive: [state.phones.n], negative: [] }},
         phones:{...state.phones, n:{...state.phones.n, features: {...state.phones.n.features, anterior: true}}}
       }
       )
@@ -33,8 +32,8 @@ describe('Phones', () => {
     const action = {type: 'ADD_FEATURE', value: {feature: 'sonorant', negativePhones: ['t']}};
     expect(stateReducer(state, action)).toEqual(
       {...state,
-        features:[...state.features, action.value.feature],
-        phones:{...state.phones, t:{features:{sonorant: false}}}
+        features:{...state.features, sonorant: { positive: [], negative: [state.phones.t] }},
+        phones:{...state.phones, t:{features:{sonorant: false}, grapheme: 't'}}
       }
     );
   });
@@ -43,9 +42,9 @@ describe('Phones', () => {
     const action = {type: 'ADD_FEATURE', value: {feature: 'sonorant', positivePhones: ['n'], negativePhones: ['t']}};
     expect(stateReducer(state, action)).toEqual(
       {...state,
-        features:[...state.features, action.value.feature],
+        features:{...state.features, sonorant: { positive: [state.phones.n], negative: [state.phones.t] }},
         phones:{...state.phones, 
-          t:{features:{sonorant: false}},
+          t:{features:{sonorant: false}, grapheme: 't'},
           n:{...state.phones.n, features: {...state.phones.n.features, sonorant: true}}
         }
       }
@@ -56,11 +55,16 @@ describe('Phones', () => {
     const action = {type: 'ADD_FEATURE', value: {feature: 'aspirated', positivePhones: ['ntʰ'], negativePhones: ['n','t']}};
     expect(stateReducer(state, action)).toEqual(
       {...state,
-        features:[...state.features, action.value.feature],
+        features:{...state.features, 
+          aspirated: {
+            positive: [state.phones.n.t.ʰ], 
+            negative: [state.phones.n, state.phones.t]
+          } 
+        },
         phones:{...state.phones, 
-          t:{features:{aspirated: false}},
+          t:{features:{aspirated: false}, grapheme: 't'},
           n:{...state.phones.n, features: {...state.phones.n.features, aspirated: false},
-            t: {ʰ:{features:{aspirated:true}}}
+            t: {ʰ:{features:{aspirated:true}, grapheme: 'ntʰ'}}
           }
         }
       }