diff --git a/backtester/backtester.py b/backtester/backtester.py
index 25806cf..7ea690c 100644
--- a/backtester/backtester.py
+++ b/backtester/backtester.py
@@ -12,8 +12,6 @@ from .strategy import Strategy
 class Backtest:
     """Backtest runner class."""
     def __init__(self, allocation, initial_capital=1_000_000, shares_per_contract=100):
-        assert isinstance(allocation, dict)
-
         assets = ('stocks', 'options', 'cash')
         total_allocation = sum(allocation.get(a, 0.0) for a in assets)
 
@@ -35,7 +33,6 @@ class Backtest:
 
     @stocks.setter
     def stocks(self, stocks):
-        assert all(isinstance(stock, Stock) for stock in stocks), 'Invalid stocks'
         assert np.isclose(sum(stock.percentage for stock in stocks), 1.0,
                           atol=0.000001), 'Stock percentages must sum to 1.0'
         self._stocks = list(stocks)
@@ -47,7 +44,6 @@ class Backtest:
 
     @options_strategy.setter
     def options_strategy(self, strat):
-        assert isinstance(strat, Strategy)
         self._options_strategy = strat
 
     @property
@@ -56,7 +52,6 @@ class Backtest:
 
     @stocks_data.setter
     def stocks_data(self, data):
-        assert isinstance(data, TiingoData)
         self._stocks_schema = data.schema
         self._stocks_data = data
 
@@ -66,7 +61,6 @@ class Backtest:
 
     @options_data.setter
     def options_data(self, data):
-        assert isinstance(data, HistoricalOptionsData)
         self._options_schema = data.schema
         self._options_data = data
 
diff --git a/backtester/datahandler/historical_options_data.py b/backtester/datahandler/historical_options_data.py
index 25aceb8..9c02f15 100644
--- a/backtester/datahandler/historical_options_data.py
+++ b/backtester/datahandler/historical_options_data.py
@@ -6,9 +6,7 @@ from .schema import Schema
 class HistoricalOptionsData:
     """Historical Options Data container class."""
     def __init__(self, file, schema=None, **params):
-        if schema:
-            assert isinstance(schema, Schema)
-        else:
+        if schema is None:
             self.schema = HistoricalOptionsData.default_schema()
 
         file_extension = os.path.splitext(file)[1]
diff --git a/backtester/datahandler/tiingo_data.py b/backtester/datahandler/tiingo_data.py
index 0f35d6e..7b48846 100644
--- a/backtester/datahandler/tiingo_data.py
+++ b/backtester/datahandler/tiingo_data.py
@@ -6,9 +6,7 @@ import pandas as pd
 class TiingoData:
     """Tiingo (stocks & indeces) Data container class."""
     def __init__(self, file, schema=None, **params):
-        if schema:
-            assert isinstance(schema, Schema)
-        else:
+        if schema is None:
             self.schema = TiingoData.default_schema()
 
         file_extension = os.path.splitext(file)[1]
diff --git a/backtester/strategy/strategy.py b/backtester/strategy/strategy.py
index 84d4036..61cc9df 100644
--- a/backtester/strategy/strategy.py
+++ b/backtester/strategy/strategy.py
@@ -2,9 +2,6 @@ import math
 
 import numpy as np
 
-from ..datahandler import Schema
-from .strategy_leg import StrategyLeg
-
 
 class Strategy:
     """Options strategy class.
@@ -12,7 +9,6 @@ class Strategy:
     entry and exit conditions.
     """
     def __init__(self, schema):
-        assert isinstance(schema, Schema)
         self.schema = schema
         self.legs = []
         self.conditions = []
@@ -20,7 +16,6 @@ class Strategy:
 
     def add_leg(self, leg):
         """Adds leg to the strategy"""
-        assert isinstance(leg, StrategyLeg)
         assert self.schema == leg.schema
         leg.name = "leg_{}".format(len(self.legs) + 1)
         self.legs.append(leg)
diff --git a/backtester/strategy/strategy_leg.py b/backtester/strategy/strategy_leg.py
index 355058a..4afd659 100644
--- a/backtester/strategy/strategy_leg.py
+++ b/backtester/strategy/strategy_leg.py
@@ -1,14 +1,9 @@
 from backtester.enums import Type, Direction
-from backtester.datahandler import Schema
 
 
 class StrategyLeg:
     """Strategy Leg data class"""
     def __init__(self, name, schema, option_type=Type.CALL, direction=Direction.BUY):
-        assert isinstance(schema, Schema)
-        assert isinstance(option_type, Type)
-        assert isinstance(direction, Direction)
-
         self.name = name
         self.schema = schema
         self.type = option_type