diff --git a/src/main/java/Assignments/A1/models/helper/Solver.java b/src/main/java/Assignments/A1/models/helper/Solver.java
index ac58546..c59c87d 100644
--- a/src/main/java/Assignments/A1/models/helper/Solver.java
+++ b/src/main/java/Assignments/A1/models/helper/Solver.java
@@ -11,6 +11,16 @@ import Assignments.A1.models.BoardNode;
  */
 public interface Solver {
 
+    /**
+     * Returns the number of nodes from the previous iterations.
+     *
+     * @precondition none
+     * @postcondition none
+     *
+     * @return the number of nodes from the interation.
+     */
+    int getNumberOfNodes();
+
     /**
      * Solves for, finds and creates a spanning representing the solving pattern.
      *