diff --git a/tests/test_read_api.py b/tests/test_read_api.py
index 536a706..2c8ecbc 100644
--- a/tests/test_read_api.py
+++ b/tests/test_read_api.py
@@ -386,4 +386,4 @@ def test_dataset_feature_weights(client):
 def test_dataset_default_feature_weights(client):
     resp = client.get("/datasets/feature_weights/default")
     assert resp.status_code == 200
-    assert resp.json == client.application.df["feature_weights"]["default_id"]
+    assert resp.json == client.application.datasets["feature_weights"]["default_id"]
diff --git a/tests/test_train.py b/tests/test_train.py
index f7b53df..8933fe9 100644
--- a/tests/test_train.py
+++ b/tests/test_train.py
@@ -46,9 +46,9 @@ def myapp():
 def data(myapp):
     np.random.seed(1000)
     from validator.validate_api import bad_vocab, common_vocab, get_question_data
-    df = myapp.df
+    datasets = myapp.datasets
     with myapp.app_context():
-        question_data = df["questions"][df["questions"]["uid"] == "9@7"].iloc[0]
+        question_data = datasets["questions"][datasets["questions"]["uid"] == "9@7"].iloc[0]
         stem_vocab = question_data["stem_words"]
         mc_vocab = question_data["mc_words"]
         vocab_set = get_question_data(question_data.uid)[0]
diff --git a/validator/app.py b/validator/app.py
index 20f6417..10bc676 100755
--- a/validator/app.py
+++ b/validator/app.py
@@ -44,16 +44,16 @@ def create_app(**kwargs):
             )
             feature_weights["default_id"] = feature_weights_key
 
-    df = {}
-    df["innovation"] = df_innovation_
-    df["domain"] = df_domain_
-    df["questions"] = df_questions_
-    df["feature_weights"] = feature_weights
-    app.df = df
+    datasets = {}
+    datasets["innovation"] = df_innovation_
+    datasets["domain"] = df_domain_
+    datasets["questions"] = df_questions_
+    datasets["feature_weights"] = feature_weights
+    app.datasets = datasets
 
     app.qids = {}
     for idcol in ("uid", "qid"):
-        app.qids[idcol] = set(df["questions"][idcol].values.tolist())
+        app.qids[idcol] = set(datasets["questions"][idcol].values.tolist())
 
     app.register_blueprint(read_api.bp)
     app.register_blueprint(write_api.bp)
diff --git a/validator/read_api.py b/validator/read_api.py
index 9899785..3220848 100755
--- a/validator/read_api.py
+++ b/validator/read_api.py
@@ -44,7 +44,7 @@ def datasets_index():
 
 
 def _books_json(include_vocabs=True):
-    data = current_app.df["domain"][["book_name", "vuid"]].rename(
+    data = current_app.datasets["domain"][["book_name", "vuid"]].rename(
         {"book_name": "name"}, axis=1
     )
     if include_vocabs:
@@ -84,7 +84,7 @@ def books_index():
 
 @bp.route("/datasets/books/<vuid>")
 def fetch_book(vuid):
-    df = current_app.df
+    df = current_app.datasets
     data = df["domain"][df["domain"]["vuid"] == vuid][["book_name", "vuid"]].rename(
         {"book_name": "name"}, axis=1
     )
@@ -105,7 +105,7 @@ def fetch_book(vuid):
 
 @bp.route("/datasets/books/<vuid>/pages")
 def fetch_page_list(vuid):
-    df = current_app.df
+    df = current_app.datasets
     book = df["innovation"][df["innovation"]["cvuid"].str.startswith(vuid)]
     if book.empty:
         _validate_vuid(vuid)
@@ -117,7 +117,7 @@ def fetch_page_list(vuid):
 
 @bp.route("/datasets/books/<vuid>/pages/<pvuid>")
 def fetch_page(vuid, pvuid):
-    df = current_app.df
+    df = current_app.datasets
     innovation = df["innovation"][df["innovation"]["cvuid"] == ":".join((vuid, pvuid))][
         "innovation_words"
     ]
@@ -151,7 +151,7 @@ def fetch_vocabs(vuid):
 
 @bp.route("/datasets/books/<vuid>/vocabularies/domain")
 def fetch_domain(vuid):
-    df = current_app.df
+    df = current_app.datasets
     data = df["domain"][df["domain"]["vuid"] == vuid]["domain_words"]
     if data.empty:
         _validate_vuid(vuid)
@@ -162,7 +162,7 @@ def fetch_domain(vuid):
 
 @bp.route("/datasets/books/<vuid>/vocabularies/innovation")
 def fetch_innovation(vuid):
-    df = current_app.df
+    df = current_app.datasets
     data = df["innovation"][df["innovation"]["cvuid"].str.startswith(vuid)][
         ["cvuid", "innovation_words"]
     ]
@@ -177,7 +177,7 @@ def fetch_innovation(vuid):
 
 @bp.route("/datasets/books/<vuid>/vocabularies/innovation/<pvuid>")
 def fetch_page_innovation(vuid, pvuid):
-    df = current_app.df
+    df = current_app.datasets
     data = df["innovation"][df["innovation"]["cvuid"] == ":".join((vuid, pvuid))][
         "innovation_words"
     ]
@@ -191,7 +191,7 @@ def fetch_page_innovation(vuid, pvuid):
 
 @bp.route("/datasets/books/<vuid>/vocabularies/questions")
 def fetch_questions(vuid):
-    df = current_app.df
+    df = current_app.datasets
     data = df["questions"][df["questions"]["cvuid"].str.startswith(vuid)].rename(
         {"uid": "exercise_uid", "mc_words": "option_words"}, axis=1
     )
@@ -217,7 +217,7 @@ def fetch_questions(vuid):
 
 @bp.route("/datasets/books/<vuid>/vocabularies/questions/<pvuid>")
 def fetch_page_questions(vuid, pvuid):
-    df = current_app.df
+    df = current_app.datasets
     data = df["questions"][df["questions"]["cvuid"] == ":".join((vuid, pvuid))].rename(
         {"uid": "exercise_uid", "mc_words": "option_words"}, axis=1
     )
@@ -241,12 +241,12 @@ def fetch_page_questions(vuid, pvuid):
 
 @bp.route("/datasets/questions")
 def questions_index():
-    return jsonify(current_app.df["questions"].uid.tolist())
+    return jsonify(current_app.datasets["questions"].uid.tolist())
 
 
 @bp.route("/datasets/questions/<uid>")
 def fetch_question(uid):
-    df = current_app.df
+    df = current_app.datasets
     data = df["questions"][df["questions"]["uid"] == uid].rename(
         {"uid": "exercise_uid", "mc_words": "option_words"}, axis=1
     )
@@ -259,7 +259,7 @@ def fetch_question(uid):
 
 @bp.route("/datasets/feature_weights")
 def feature_weights_index():
-    fw_ids = list(current_app.df["feature_weights"].keys())
+    fw_ids = list(current_app.datasets["feature_weights"].keys())
     fw_ids.remove("default_id")
     return jsonify(fw_ids)
 
@@ -267,7 +267,7 @@ def feature_weights_index():
 @bp.route("/datasets/feature_weights/<fw_id>")
 def fetch_feature_weights(fw_id):
     _validate_uuid(fw_id)
-    df = current_app.df
+    df = current_app.datasets
     try:
         data = df["feature_weights"][fw_id]
     except KeyError:
@@ -278,7 +278,7 @@ def fetch_feature_weights(fw_id):
 
 @bp.route("/datasets/feature_weights/default")
 def fetch_default_feature_weights():
-    return jsonify(current_app.df["feature_weights"]["default_id"])
+    return jsonify(current_app.datasets["feature_weights"]["default_id"])
 
 
 @bp.route("/ping")
@@ -290,9 +290,8 @@ def ping():
 def status():
     global start_time
     data = {"version": _version.get_versions(), "started": start_time}
-
-    if "vuid" in current_app.df["domain"].columns:
-        fw_ids = list(current_app.df["feature_weights"].keys())
+    if "vuid" in current_app.datasets["domain"].columns:
+        fw_ids = list(current_app.datasets["feature_weights"].keys())
         fw_ids.remove("default_id")
         data["datasets"] = {
             "books": _books_json(include_vocabs=False),
@@ -304,13 +303,13 @@ def status():
 
 @bp.route("/status/defaults/feature_weights_id")
 def fetch_default_feature_weights_id():
-    return jsonify(current_app.df["feature_weights"]["default_id"])
+    return jsonify(current_app.datasets["feature_weights"]["default_id"])
 
 
 @bp.route("/status/defaults")
 def fetch_default_feature_weights_set():
-    default_id = current_app.df["feature_weights"]["default_id"]
-    return jsonify(current_app.df["feature_weights"][default_id])
+    default_id = current_app.datasets["feature_weights"]["default_id"]
+    return jsonify(current_app.datasets["feature_weights"][default_id])
 
 
 @bp.route("/version")
diff --git a/validator/training_api.py b/validator/training_api.py
index c57b4df..b0da023 100755
--- a/validator/training_api.py
+++ b/validator/training_api.py
@@ -64,7 +64,7 @@ def validation_train():
     # Temp install of weights
 
     temp_fw_id = f"training-{uuid4()}"
-    current_app.df["feature_weights"][temp_fw_id] = train_feature_dict
+    current_app.datasets["feature_weights"][temp_fw_id] = train_feature_dict
 
     output_df = response_df.apply(
         lambda x: validate_response(
@@ -76,7 +76,7 @@ def validation_train():
     output_df["valid_label"] = response_df["valid_label"]
 
     # remove temp weights
-    current_app.df["feature_weights"].pop(temp_fw_id)
+    current_app.datasets["feature_weights"].pop(temp_fw_id)
 
     # Do an N-fold cross validation if cv > 1.
     # Then get coefficients/intercept for the entire dataset
diff --git a/validator/validate_api.py b/validator/validate_api.py
index a69b4e6..ab0324b 100755
--- a/validator/validate_api.py
+++ b/validator/validate_api.py
@@ -70,21 +70,21 @@ def setup_parse_and_data(setup_state):
 
 
 def get_question_data_by_key(key, val):
-    df = current_app.df
+    datasets = current_app.datasets
     # FIXME - should use all the questions and combine associated pages
     # FIXME - last_q works better because of some dirty data getting through
     # that has innovation pages but not the exact book those pages are from
-    last_q = df["questions"][df["questions"][key] == val].iloc[-1]
+    last_q = datasets["questions"][datasets["questions"][key] == val].iloc[-1]
     module_id = last_q.cvuid
     uid = last_q.uid
     has_numeric = bool(last_q.contains_number)
     innovation_vocab = (
-        df["innovation"][df["innovation"]["cvuid"] == module_id]
+        datasets["innovation"][datasets["innovation"]["cvuid"] == module_id]
         .iloc[0]
         .innovation_words
     )
     vuid = module_id.split(":")[0]
-    domain_vocab_df = df["domain"][df["domain"]["vuid"] == vuid]
+    domain_vocab_df = datasets["domain"][datasets["domain"]["vuid"] == vuid]
     if domain_vocab_df.empty:
         domain_vocab = set()
     else:
@@ -153,7 +153,7 @@ def parse_and_classify(
     )
 
     # Fetch feature weights by ID
-    feature_weight_dict = current_app.df["feature_weights"][feature_weights_id]
+    feature_weight_dict = current_app.datasets["feature_weights"][feature_weights_id]
 
     # Initialize all feature counts to 0
     # ORDER OF KEYS in feature_weight_dict is preserved, and matters!
@@ -215,7 +215,7 @@ def validate_response(
     if lazy_math_mode is None:
         lazy_math_mode = PARSER_DEFAULTS["lazy_math_mode"]
     if feature_weights_id is None:
-        feature_weights_id = current_app.df["feature_weights"]["default_id"]
+        feature_weights_id = current_app.datasets["feature_weights"]["default_id"]
 
     # Try to get questions-specific vocab via uid (if not found, vocab will be empty)
     # domain_vocab, innovation_vocab, has_numeric, uid_used, question_vocab,
@@ -305,10 +305,10 @@ def validation_api_entry():
     response = args.get("response", None)
     uid = args.get("uid", None)
     feature_weights_set_id = args.get(
-        "feature_weights_set_id", current_app.df["feature_weights"]["default_id"]
+        "feature_weights_set_id", current_app.datasets["feature_weights"]["default_id"]
     )
 
-    if feature_weights_set_id not in current_app.df["feature_weights"]:
+    if feature_weights_set_id not in current_app.datasets["feature_weights"]:
         raise InvalidUsage("feature_weights_set_id not found", status_code=404)
 
     parser_params = {
@@ -321,7 +321,7 @@ def validation_api_entry():
         response, uid, feature_weights_id=feature_weights_set_id, **parser_params
     )
 
-    return_dictionary["feature_weights"] = current_app.df["feature_weights"][
+    return_dictionary["feature_weights"] = current_app.datasets["feature_weights"][
         feature_weights_set_id
     ]
 
diff --git a/validator/write_api.py b/validator/write_api.py
index 0166fd8..ebd309f 100755
--- a/validator/write_api.py
+++ b/validator/write_api.py
@@ -32,55 +32,55 @@ def update_fixed_data(df_domain_, df_innovation_, df_questions_):
     # AEW: I feel like I am sinning against nature here . . .
     # Do we need to store these in a Redis cache or db???
     # This was all well and good before we ever tried to modify things
-    df = current_app.df
+    datasets = current_app.datasets
 
     # Remove any entries from the domain, innovation, and question dataframes
     # that are duplicated by the new data
     book_id = df_domain_.iloc[0]["vuid"]
-    if "vuid" in df["domain"].columns:
-        df["domain"] = df["domain"][df["domain"]["vuid"] != book_id]
-    if "cvuid" in df["domain"].columns:
-        df["innovation"] = df["innovation"][
-            ~(df["innovation"]["cvuid"].star.startswith(book_id))
+    if "vuid" in datasets["domain"].columns:
+        datasets["domain"] = datasets["domain"][datasets["domain"]["vuid"] != book_id]
+    if "cvuid" in datasets["domain"].columns:
+        datasets["innovation"] = datasets["innovation"][
+            ~(datasets["innovation"]["cvuid"].star.startswith(book_id))
         ]
     uids = df_questions_["uid"].unique()
-    if "uid" in df["questions"].columns:
-        df["questions"] = df["questions"][
+    if "uid" in datasets["questions"].columns:
+        datasets["questions"] = datasets["questions"][
             ~(
-                df["questions"]["uid"].isin(uids)
-                & df["questions"]["cvuid"].str.startswith(book_id)
+                datasets["questions"]["uid"].isin(uids)
+                & datasets["questions"]["cvuid"].str.startswith(book_id)
             )
         ]
 
     # Now append the new dataframes to the in-memory ones
-    df["domain"] = df["domain"].append(df_domain_, sort=False)
-    df["innovation"] = df["innovation"].append(df_innovation_, sort=False)
-    df["questions"] = df["questions"].append(df_questions_, sort=False)
+    datasets["domain"] = datasets["domain"].append(df_domain_, sort=False)
+    datasets["innovation"] = datasets["innovation"].append(df_innovation_, sort=False)
+    datasets["questions"] = datasets["questions"].append(df_questions_, sort=False)
 
     # Update qid sets - for shortcutting question lookup
     for idcol in ("uid", "qid"):
-        current_app.qids[idcol] = set(df["questions"][idcol].values.tolist())
+        current_app.qids[idcol] = set(datasets["questions"][idcol].values.tolist())
 
     # Finally, write the updated dataframes to disk and declare victory
     data_dir = current_app.config["DATA_DIR"]
-    write_fixed_data(df["domain"], df["innovation"], df["questions"], data_dir)
+    write_fixed_data(datasets["domain"], datasets["innovation"], datasets["questions"], data_dir)
 
 
 def store_feature_weights(new_feature_weights):
     # Allows removing duplicate sets in feature weights
     # Sees if the incoming set matches with fw set
 
-    df = current_app.df
-    for fw_id, existing_feature_weights in df["feature_weights"].items():
+    datasets = current_app.datasets
+    for fw_id, existing_feature_weights in datasets["feature_weights"].items():
 
         if existing_feature_weights == new_feature_weights:
             result_id = fw_id
             break
     else:
         result_id = uuid.uuid4()
-        df["feature_weights"][str(result_id)] = new_feature_weights
+        datasets["feature_weights"][str(result_id)] = new_feature_weights
         data_dir = current_app.config["DATA_DIR"]
-        write_feature_weights(df["feature_weights"], data_dir)
+        write_feature_weights(datasets["feature_weights"], data_dir)
 
     return result_id
 
@@ -89,15 +89,15 @@ def write_default_feature_weights_id(new_default_id):
     # Allows removing duplicate sets in feature weights
     # Sees if the incoming set matches with fw set
 
-    df = current_app.df
+    datasets = current_app.datasets
 
-    if new_default_id == df["feature_weights"]["default_id"]:
+    if new_default_id == datasets["feature_weights"]["default_id"]:
         return new_default_id
 
     else:
-        df["feature_weights"]["default_id"] = new_default_id
+        datasets["feature_weights"]["default_id"] = new_default_id
         data_dir = current_app.config["DATA_DIR"]
-        write_feature_weights(df["feature_weights"], data_dir)
+        write_feature_weights(datasets["feature_weights"], data_dir)
 
     return new_default_id
 
@@ -185,14 +185,14 @@ def new_feature_weights_set():
 @bp.route("/datasets/feature_weights/default", methods=["PUT"])
 @cross_origin(supports_credentials=True)
 def set_default_feature_weights_id():
-    df = current_app.df
+    datasets = current_app.datasets
     if not request.is_json:
         raise InvalidUsage(
             "Unable to load new default id as json file.", status_code=404
         )
     else:
         new_default_id = request.json
-        if new_default_id not in df["feature_weights"].keys():
+        if new_default_id not in datasets["feature_weights"].keys():
             raise InvalidUsage("Feature weight id not found.", status_code=400)
     default_id = write_default_feature_weights_id(new_default_id)
     return jsonify(