diff --git a/docs/en/topics/datamodel.md b/docs/en/topics/datamodel.md
index 285ddb7b1..efb129516 100755
--- a/docs/en/topics/datamodel.md
+++ b/docs/en/topics/datamodel.md
@@ -272,7 +272,7 @@ This would be equivalent to a SQL query of
 The where clauses showcased in the previous two sections (filter and exclude)
 specify exact matches by default. However, there are a number of suffixes that
 you can put on field names to change this behavior such as `":StartsWith"`,
-`":EndsWith"`, `":PartialMatch"`, `":GreaterThan"`, `":LessThan"`,
+`":EndsWith"`, `":PartialMatch"`, `":GreaterThan"`, `":GreaterThanOrEqual"`, `":LessThan"`, `":LessThanOrEqual"`,
 `":Negation"`.
 
 Each of these suffixes is represented in the ORM as a subclass of
diff --git a/search/filters/ComparisonFilter.php b/search/filters/ComparisonFilter.php
new file mode 100755
index 000000000..d15dc4a2a
--- /dev/null
+++ b/search/filters/ComparisonFilter.php
@@ -0,0 +1,79 @@
+<?php
+/**
+ * Base class for creating comparison filters, eg; greater than, less than, greater than or equal, etc
+ *
+ * If you extend this abstract class, you must implement getOperator() and and getInverseOperator
+ *
+ * getOperator() should return a string operator that will be applied to the filter,
+ * eg; if getOperator() returns "<" then this will be a LessThan filter
+ *
+ * getInverseOperator() should return a string operator that evaluates the inverse of getOperator(),
+ * eg; if getOperator() returns "<", then the inverse should be ">=
+ *
+ * @package framework
+ * @subpackage search
+ */
+abstract class ComparisonFilter extends SearchFilter {
+
+	/**
+	 * Should return an operator to be used for comparisons
+	 *
+	 * @return string Operator
+	 */
+	abstract protected function getOperator();
+
+	/**
+	 * Should return an inverse operator to be used for comparisons
+	 *
+	 * @return string Inverse operator
+	 */
+	abstract protected function getInverseOperator();
+
+	/**
+	 * Applies a comparison filter to the query
+	 * Handles SQL escaping for both numeric and string values
+	 *
+	 * @param DataQuery $query
+	 * @return $this|DataQuery
+	 */
+	protected function applyOne(DataQuery $query) {
+		$this->model = $query->applyRelation($this->relation);
+		$value = $this->getDbFormattedValue();
+
+		if(is_numeric($value)) {
+			$filter = sprintf("%s %s %s",
+				$this->getDbName(), $this->getOperator(), Convert::raw2sql($value));
+		} else {
+			$filter = sprintf("%s %s '%s'",
+				$this->getDbName(), $this->getOperator(), Convert::raw2sql($value));
+		}
+
+		return $query->where($filter);
+	}
+
+	/**
+	 * Applies a exclusion(inverse) filter to the query
+	 * Handles SQL escaping for both numeric and string values
+	 *
+	 * @param DataQuery $query
+	 * @return $this|DataQuery
+	 */
+	protected function excludeOne(DataQuery $query) {
+		$this->model = $query->applyRelation($this->relation);
+		$value = $this->getDbFormattedValue();
+
+		if(is_numeric($value)) {
+			$filter = sprintf("%s %s %s",
+				$this->getDbName(), $this->getInverseOperator(), Convert::raw2sql($value));
+		} else {
+			$filter = sprintf("%s %s '%s'",
+				$this->getDbName(), $this->getInverseOperator(), Convert::raw2sql($value));
+		}
+
+		return $query->where($filter);
+	}
+
+	public function isEmpty() {
+		return $this->getValue() === array() || $this->getValue() === null || $this->getValue() === '';
+	}
+}
diff --git a/search/filters/GreaterThanFilter.php b/search/filters/GreaterThanFilter.php
old mode 100644
new mode 100755
index a17c3a2f5..bd5cd3046
--- a/search/filters/GreaterThanFilter.php
+++ b/search/filters/GreaterThanFilter.php
@@ -2,40 +2,20 @@
 /**
  * Selects numerical/date content greater than the input
  *
- * @todo documentation
- * 
+ * Can be used by SearchContext and DataList->filter, eg;
+ * Model::get()->filter("Field1:GreaterThan", $value);
+ *
  * @package framework
  * @subpackage search
  */
-class GreaterThanFilter extends SearchFilter {
-	
-	/**
-	 * @return DataQuery
-	 */
-	protected function applyOne(DataQuery $query) {
-		$this->model = $query->applyRelation($this->relation);
-		$value = $this->getDbFormattedValue();
+class GreaterThanFilter extends ComparisonFilter {
 
-		if(is_numeric($value)) $filter = sprintf("%s > %s", $this->getDbName(), Convert::raw2sql($value));
-		else $filter = sprintf("%s > '%s'", $this->getDbName(), Convert::raw2sql($value));
-		
-		return $query->where($filter);
+	protected function getOperator() {
+		return ">";
 	}
 
-	/**
-	 * @return DataQuery
-	 */
-	protected function excludeOne(DataQuery $query) {
-		$this->model = $query->applyRelation($this->relation);
-		$value = $this->getDbFormattedValue();
+	protected function getInverseOperator() {
+		return "<=";
+	}
 
-		if(is_numeric($value)) $filter = sprintf("%s <= %s", $this->getDbName(), Convert::raw2sql($value));
-		else $filter = sprintf("%s <= '%s'", $this->getDbName(), Convert::raw2sql($value));
-		
-		return $query->where($filter);
-	}
-	
-	public function isEmpty() {
-		return $this->getValue() === array() || $this->getValue() === null || $this->getValue() === '';
-	}
 }
diff --git a/search/filters/GreaterThanOrEqualFilter.php b/search/filters/GreaterThanOrEqualFilter.php
new file mode 100755
index 000000000..e71e47130
--- /dev/null
+++ b/search/filters/GreaterThanOrEqualFilter.php
@@ -0,0 +1,21 @@
+<?php
+/**
+ * Selects numerical/date content greater than or equal to the input
+ *
+ * Can be used by SearchContext and DataList->filter, eg;
+ * Model::get()->filter("Field1:GreaterThanOrEqual", $value);
+ *
+ * @package framework
+ * @subpackage search
+ */
+class GreaterThanOrEqualFilter extends ComparisonFilter {
+
+	protected function getOperator() {
+		return ">=";
+	}
+
+	protected function getInverseOperator() {
+		return "<";
+	}
+
+}
diff --git a/search/filters/LessThanFilter.php b/search/filters/LessThanFilter.php
old mode 100644
new mode 100755
index 6c9538ab8..da1a77fef
--- a/search/filters/LessThanFilter.php
+++ b/search/filters/LessThanFilter.php
@@ -1,41 +1,21 @@
 <?php
 /**
- * Selects numerical/date content smaller than the input
+ * Selects numerical/date content less than the input
+ *
+ * Can be used by SearchContext and DataList->filter, eg;
+ * Model::get()->filter("Field1:LessThan", $value);
  *
- * @todo documentation
- * 
  * @package framework
  * @subpackage search
  */
-class LessThanFilter extends SearchFilter {
-	
-	/**
-	 * @return DataQuery
-	 */
-	protected function applyOne(DataQuery $query) {
-		$this->model = $query->applyRelation($this->relation);
-		$value = $this->getDbFormattedValue();
+class LessThanFilter extends ComparisonFilter {
 
-		if(is_numeric($value)) $filter = sprintf("%s < %s", $this->getDbName(), Convert::raw2sql($value));
-		else $filter = sprintf("%s < '%s'", $this->getDbName(), Convert::raw2sql($value));
-		
-		return $query->where($filter);
+	protected function getOperator() {
+		return "<";
 	}
 
-	/**
-	 * @return DataQuery
-	 */
-	protected function excludeOne(DataQuery $query) {
-		$this->model = $query->applyRelation($this->relation);
-		$value = $this->getDbFormattedValue();
+	protected function getInverseOperator() {
+		return ">=";
+	}
 
-		if(is_numeric($value)) $filter = sprintf("%s >= %s", $this->getDbName(), Convert::raw2sql($value));
-		else $filter = sprintf("%s >= '%s'", $this->getDbName(), Convert::raw2sql($value));
-		
-		return $query->where($filter);
-	}
-	
-	public function isEmpty() {
-		return $this->getValue() === array() || $this->getValue() === null || $this->getValue() === '';
-	}
 }
diff --git a/search/filters/LessThanOrEqualFilter.php b/search/filters/LessThanOrEqualFilter.php
new file mode 100755
index 000000000..c77685675
--- /dev/null
+++ b/search/filters/LessThanOrEqualFilter.php
@@ -0,0 +1,21 @@
+<?php
+/**
+ * Selects numerical/date content less than or equal to the input
+ *
+ * Can be used by SearchContext and DataList->filter, eg;
+ * Model::get()->filter("Field1:LessThanOrEqual", $value);
+ *
+ * @package framework
+ * @subpackage search
+ */
+class LessThanOrEqualFilter extends ComparisonFilter {
+
+	protected function getOperator() {
+		return "<=";
+	}
+
+	protected function getInverseOperator() {
+		return ">";
+	}
+
+}
diff --git a/tests/model/DataListTest.php b/tests/model/DataListTest.php
old mode 100644
new mode 100755
index d9112dcf6..2c647260a
--- a/tests/model/DataListTest.php
+++ b/tests/model/DataListTest.php
@@ -445,17 +445,35 @@ class DataListTest extends SapphireTest {
 		$list = DataObjectTest_TeamComment::get();
 		$list = $list->filter('TeamID:GreaterThan', $this->idFromFixture('DataObjectTest_Team', 'team1'));
 		$this->assertEquals(1, $list->count());
-		$this->assertEquals('Phil', $list->first()->Name, 'First comment should be from Bob');
+		$this->assertEquals('Phil', $list->first()->Name, 'First comment should be from Phil');
 	}
 
-	// public function testSimpleFilterLessThanFilter() {
-	// 	$list = DataObjectTest_TeamComment::get();
-	// 	$list = $list->filter('TeamID:LessThan', 
-	// 	$this->idFromFixture('DataObjectTest_TeamComment', 'comment2'))->sort('Name');
-	// 	$this->assertEquals(2, $list->count());
-	// 	$this->assertEquals('Bob', $list->first()->Name, 'First comment should be from Bob');
-	// 	$this->assertEquals('Joe', $list->Last()->Name, 'Last comment should be from Joe');
-	// }
+	public function testSimpleFilterGreaterThanOrEqualFilter() {
+		$list = DataObjectTest_TeamComment::get();
+		$list = $list->filter('TeamID:GreaterThanOrEqual',
+			$this->idFromFixture('DataObjectTest_Team', 'team1'))->sort("ID");
+		$this->assertEquals(3, $list->count());
+		$this->assertEquals('Joe', $list->first()->Name, 'First comment should be from Joe');
+		$this->assertEquals('Phil', $list->last()->Name, 'Last comment should be from Phil');
+	}
+
+	public function testSimpleFilterLessThanFilter() {
+		$list = DataObjectTest_TeamComment::get();
+		$list = $list->filter('TeamID:LessThan',
+			$this->idFromFixture('DataObjectTest_Team', 'team2'))->sort('Name');
+		$this->assertEquals(2, $list->count());
+		$this->assertEquals('Bob', $list->first()->Name, 'First comment should be from Bob');
+		$this->assertEquals('Joe', $list->Last()->Name, 'Last comment should be from Joe');
+	}
+
+	public function testSimpleFilterLessThanOrEqualFilter() {
+		$list = DataObjectTest_TeamComment::get();
+		$list = $list->filter('TeamID:LessThanOrEqual',
+			$this->idFromFixture('DataObjectTest_Team', 'team1'))->sort('ID');
+		$this->assertEquals(2, $list->count());
+		$this->assertEquals('Joe', $list->first()->Name, 'First comment should be from Joe');
+		$this->assertEquals('Bob', $list->Last()->Name, 'Last comment should be from Bob');
+	}
 
 	public function testSimplePartialMatchFilter() {
 		$list = DataObjectTest_TeamComment::get();