diff --git a/build.py b/build.py
index 35cdd2a..f1d1944 100644
--- a/build.py
+++ b/build.py
@@ -1,26 +1,51 @@
+import matplotlib.pyplot as plt
+import seaborn as sns
+from scipy.stats import norm
+import pandas as pd
+
 def get_categorical_variables(df):
-    return []
+    df['new_user'] = df['new_user'].astype('category')
+    df['converted'] = df['converted'].astype('category')
+    cat_cols = df.select_dtypes(include=['object','category']).columns
+    return cat_cols
 
 
 def get_numerical_variables(df):
-    return []
-
+    df['new_user'] = df['new_user'].astype('category')
+    df['converted'] = df['converted'].astype('category')
+    num_cols = df.select_dtypes(exclude=['object','category']).columns
+    return num_cols
 
 def get_numerical_variables_percentile(df):
-    pass
+    df['new_user'] = df['new_user'].astype('category')
+    df['converted'] = df['converted'].astype('category')
+    num_cols = df.select_dtypes(exclude=['object','category']).columns
+    return df[num_cols].describe()
 
 
 def get_categorical_variables_modes(df):
-    pass
+    df['new_user'] = df['new_user'].astype('category')
+    df['converted'] = df['converted'].astype('category')
+    cat_cols = df.select_dtypes(include=['object','category']).columns
+    return df[cat_cols].mode()
 
 
 def get_missing_values_count(df):
-    pass
-
+    return pd.isnull(df).sum().reset_index()
 
 def plot_histogram_with_numerical_values(df):
-    pass
-
+    df['new_user'] = df['new_user'].astype('category')
+    df['converted'] = df['converted'].astype('category')
+    num_cols = df.select_dtypes(exclude=['object','category']).columns
+    plt.subplot(121)
+    plt.title(num_cols[0])
+    sns.distplot(df[num_cols[0]], color='yellow', fit=norm, kde=False)
+    plt.subplot(122)
+    plt.title(num_cols[1])
+    sns.distplot(df[num_cols[1]], color='yellow', fit=norm, kde=False)
 
 def plot_facet_box(df):
-    pass
+    plt.subplot(121)
+    sns.boxplot('converted','age',data=df)
+    plt.subplot(122)
+    sns.boxplot('converted','total_pages_visited',data=df)
diff --git a/build.pyc b/build.pyc
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index 0000000..07984a5
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diff --git a/tests/__init__.pyc b/tests/__init__.pyc
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index 0000000..ca9c535
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diff --git a/tests/test_get_categorical_variables.pyc b/tests/test_get_categorical_variables.pyc
new file mode 100644
index 0000000..14817c8
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