diff --git a/AcquistionFunctions/PreferenceExpectedImprovement.py b/AcquistionFunctions/PreferenceExpectedImprovement.py
index 83bbe3c..c47f937 100644
--- a/AcquistionFunctions/PreferenceExpectedImprovement.py
+++ b/AcquistionFunctions/PreferenceExpectedImprovement.py
@@ -3,7 +3,16 @@ from scipy.stats import norm
 
 
 class PreferenceExpectedImprovement:
-    def __init__(self):
+    def __init__(self, nr_samples, upper_bound, lower_bound, nr_dims=2):
+
+        self.nr_samples = nr_samples
+        self.upper_bound = upper_bound
+        self.lower_bound = lower_bound
+
+        self.user_model = None
+        self.proposal_model_mean = np.array()
+
+    def initialize(self):
         pass
 
     def rejection_sampling(self):