diff --git a/Axel/src/de/hs_mannheim/informatik/spreadsheet/Spreadsheet.java b/Axel/src/de/hs_mannheim/informatik/spreadsheet/Spreadsheet.java
index 63e20ee..a123873 100644
--- a/Axel/src/de/hs_mannheim/informatik/spreadsheet/Spreadsheet.java
+++ b/Axel/src/de/hs_mannheim/informatik/spreadsheet/Spreadsheet.java
@@ -76,7 +76,6 @@ public class Spreadsheet {
 	 * @param path The file to read.
 	 * @param separator The char used to split up the input, e.g. a comma or a semicolon.
 	 * @param startCellName The upper left cell where data from the CSV file should be inserted.
-	 * @return Nothing.
 	 * @exception IOException If path does not exist.
 	 */
 	public void readCsv(String path, char separator, String startCellName) throws FileNotFoundException {
@@ -86,7 +85,6 @@ public class Spreadsheet {
 	/**
 	 * A method for saving data to a CSV file.
 	 * @param path The file to write.
-	 * @return Nothing.
 	 * @exception IOException If path does not exist.
 	 */
 	public void saveCsv(String path) throws FileNotFoundException {
@@ -112,7 +110,6 @@ public class Spreadsheet {
 	 * This method does the actual evaluation/calcluation of a specific cell
 	 * @param row the row of the cell to be evaluated
 	 * @param col the col of the cell to be evaluated
-	 * @return Nothing.
 	 */
 	private void evaluateCell(int row, int col) {
 		String formula = cells[row][col].getFormula();
@@ -150,8 +147,21 @@ public class Spreadsheet {
 	 * @return The sum calculated.
 	 */
 	private long sum(String startCellName, String endCellName) {
+		long result = 0;
 
-		return 0;
+		for(char col = startCellName.charAt(0); col <= endCellName.charAt(0); col++){
+
+			for(int row = Integer.parseInt(startCellName.substring(1)); row <= Integer.parseInt(endCellName.substring(1)); row++) {
+
+				String value = get((row - 1), (col - 'A'));
+				System.out.println(value);
+
+				if(!value.isEmpty()){
+					result += Long.parseLong(value);
+				}
+			}
+		}
+		return result;
 	}
 
 	/**