diff --git a/src/survivor_selection/survivor_selection_methods.py b/src/survivor_selection/survivor_selection_methods.py
index 78f5420..48d9128 100644
--- a/src/survivor_selection/survivor_selection_methods.py
+++ b/src/survivor_selection/survivor_selection_methods.py
@@ -3,41 +3,32 @@ import random
 class Survivor_Selection:
     """Survivor selection determines which individuals should be brought to the next generation"""
 
+    def __append_to_next_population(survivor_method):
+        return lambda ga: ga.population.append_children(survivor_method(ga))
+
+
+    @__append_to_next_population
     def fill_in_best(ga):
         """Fills in the next population with the best chromosomes from the last population"""
 
         needed_amount = len(ga.population) - ga.population.total_children
-
-        ga.population.append_children(
-            ga.population[:needed_amount]
-        )
+        return ga.population[:needed_amount]
 
 
+    @__append_to_next_population
     def fill_in_random(ga):
         """Fills in the next population with random chromosomes from the last population"""
 
         needed_amount = len(ga.population) - ga.population.total_children
-
-        ga.population.append_children([  # add in chromosomes
-            random.choice(               #     randomly
-                ga.population            #         from the population
-            )                            # 
-        for n in range(needed_amount)])  # until the next population is full
+        return [random.choice(ga.population) for n in range(needed_amount)]
 
 
+    @__append_to_next_population
     def fill_in_parents_then_random(ga):
         """Fills in the next population with all parents followed by random chromosomes from the last population"""
 
         needed_amount = len(ga.population) - ga.population.total_children
-        parent_amount = max(len(ga.population.total_parents), needed_amount)
+        parent_amount = min(ga.population.total_parents, needed_amount)
         random_amount = needed_amount - parent_amount
 
-        ga.population.append_children(                       # add in chromosomes
-            ga.population.get_mating_pool()[:parent_amount]  #     from the mating pool
-        )                                                    # 
-
-        ga.population.append_children([  # add in chromosomes
-            random.choice(               #     randomly
-                ga.population            #         from the population
-            )                            # 
-        for n in range(random_amount)])  # until the next population is full
+        return ga.population.get_mating_pool()[:parent_amount] + [random.choice(ga.population) for n in range(random_amount)]