diff --git a/Unit_testing/Schema.php b/Unit_testing/Schema.php
index c3e6d7d..e70f926 100644
--- a/Unit_testing/Schema.php
+++ b/Unit_testing/Schema.php
@@ -619,14 +619,14 @@
 	}
 	
 	
-// 	/**
-// 	 *	Data provider to return a list of referenced table and columns for each foreign key.
-// 	 *
-// 	 *	If your test needs to iterate through all of the referenced tables and columns of the table's foreign keys, then use this method as the data provider. Each referenced table name plus a list of the referencing columns is presented to the consumer in turn.
-// 	 *
-// 	 *	@access public
-// 	 *	@return array( array( string, array( string+ ) )* )
-// 	 */
+	/**
+	 *	Data provider to return a list of referenced table and columns for each foreign key.
+	 *
+	 *	If your test needs to iterate through all of the referenced tables and columns of the table's foreign keys, then use this method as the data provider. Each referenced table name plus a list of the referencing columns is presented to the consumer in turn.
+	 *
+	 *	@access public
+	 *	@return array( array( string, array( string+ ) )* )
+	 */
 // 	public function provideFKDetails()
 // 	{
 // 		$theList = array();
@@ -649,7 +649,6 @@
 	 */
 	protected function assertTableExists()
 	{
-// 		echo "\n[[ Testing whether " . ucfirst( strtolower( $this->getTableName() ) ) . " table exists ]]\n";
 		self::$reporter->report( Reporter::STATUS_TEST, "[[ %s ]] ", array( ucfirst( strtolower( $this->getTableName() ) ) ) );
 		
 		$queryString = sprintf(
@@ -658,15 +657,21 @@
 			 WHERE ( Table_Name = '%s' )",
 			strtoupper( $this->getTableName() )
 		);
-//	 	echo "$queryString\n";
 		
-		$errorString = sprintf(
-			"couldn't find the %s table [%+1.1f] --- check for misspelled [%+1.1f] or delimited [%+1.1f] identifiers",
-			ucfirst( strtolower( $this->getTableName() ) ),
-			$this->markAdjustments['missingTable'],
-			$this->markAdjustments['misspelledIdentifier'],
-			$this->markAdjustments['delimitedIdentifier']
-		);
+		if ( RUN_MODE === 'staff' )
+		{
+			$errorString = sprintf(
+				"couldn't find the %s table [%+1.1f] --- check for misspelled [%+1.1f] or delimited [%+1.1f] identifiers",
+				ucfirst( strtolower( $this->getTableName() ) ),
+				$this->markAdjustments['missingTable'],
+				$this->markAdjustments['misspelledIdentifier'],
+				$this->markAdjustments['delimitedIdentifier']
+			);
+		}
+		else if ( RUN_MODE === 'student' )
+		{
+			$errorString = sprintf( "couldn't find the %s table", ucfirst( strtolower( $this->getTableName() ) ) );
+		}
 		
 		$actual = $this->getConnection()->createQueryTable( "user_tables", $queryString );
 		$this->assertEquals( 1, $actual->getRowCount(), $errorString );
@@ -683,7 +688,6 @@
 	 */
 	protected function assertColumnExists( $columnName )
 	{
-// 		echo "\n[[ Testing whether " . ucfirst( strtolower( $this->getTableName() ) ) . '.' . ucfirst( strtolower( $columnName ) ) . " exists ]]\n";
 		self::$reporter->report( Reporter::STATUS_TEST, "[[ %s.%s ]] ",
 			array( ucfirst( strtolower( $this->getTableName() ) ), ucfirst( strtolower( $columnName ) ) ) );
 		
@@ -694,17 +698,27 @@
 			strtoupper( $this->getTableName() ),
 			strtoupper( $columnName )
 		);
-//	 	echo "$queryString\n";
 		
 		$actual = $this->getConnection()->createQueryTable( $this->getTableName() . '_' . $columnName, $queryString );
 		
-		$errorString = sprintf(
-			"couldn't find the %s.%s column --- check for misspelled [%+1.1f] or delimited [%+1.1f] identifiers",
-			ucfirst( strtolower( $this->getTableName() ) ),
-			ucfirst( strtolower( $columnName ) ),
-			$this->markAdjustments['misspelledIdentifier'],
-			$this->markAdjustments['delimitedIdentifier']
-		);
+		if ( RUN_MODE === 'staff' )
+		{
+			$errorString = sprintf(
+				"couldn't find the %s.%s column --- check for misspelled [%+1.1f] or delimited [%+1.1f] identifiers",
+				ucfirst( strtolower( $this->getTableName() ) ),
+				ucfirst( strtolower( $columnName ) ),
+				$this->markAdjustments['misspelledIdentifier'],
+				$this->markAdjustments['delimitedIdentifier']
+			);
+		}
+		else if ( RUN_MODE === 'student' )
+		{
+			$errorString = sprintf(	"couldn't find the %s.%s column",
+									ucfirst( strtolower( $this->getTableName() ) ),
+									ucfirst( strtolower( $columnName ) )	);
+		}
+		
+		// check for alternative column names here?
 						
 		$this->assertEquals( 1, $actual->getRowCount(), $errorString );
 	}
@@ -720,11 +734,18 @@
 	 */
 	protected function assertColumnDataType( $columnName, $columnTypeList )
 	{
-// 		echo "\n[[ Testing whether " . ucfirst( strtolower( $this->getTableName() ) ) . '.' . ucfirst( strtolower( $columnName ) ) . " data type is " . implode( ' | ', $columnTypeList ) . " ]]\n";
-// 		self::$reporter->report( Reporter::STATUS_TEST, "[[ %s.%s: %s ]] ",
-// 			array( ucfirst( strtolower( $this->getTableName() ) ), ucfirst( strtolower( $columnName ) ), implode( ' | ', $columnTypeList ) ) );
-		self::$reporter->report( Reporter::STATUS_TEST, "[[ %s.%s data type ]] ",
-			array( ucfirst( strtolower( $this->getTableName() ) ), ucfirst( strtolower( $columnName ) ) ) );
+		if ( RUN_MODE === 'staff' )
+		{
+			self::$reporter->report(	Reporter::STATUS_TEST, "[[ %s.%s: data type is %s ]] ",
+										array(	ucfirst( strtolower( $this->getTableName() ) ),
+												ucfirst( strtolower( $columnName ) ),
+												implode( ' | ', $columnTypeList ) ) );
+		}
+		else if ( RUN_MODE === 'student' )
+		{
+			self::$reporter->report(	Reporter::STATUS_TEST, "[[ %s.%s data type ]] ",
+										array( ucfirst( strtolower( $this->getTableName() ) ), ucfirst( strtolower( $columnName ) ) ) );
+		}
 		
 		$queryString = sprintf(
 			"SELECT Data_Type
@@ -733,24 +754,26 @@
 			strtoupper( $this->getTableName() ),
 			strtoupper( $columnName )
 		);
-//	 	echo "$queryString\n";
 		
 		$actual = $this->getConnection()->createQueryTable( $this->getTableName() . '_' . $columnName, $queryString );
 		
-// 		$errorString = sprintf(
-// 			'column %s.%s has unexpected data type %s [%+1.1f]',
-// 			ucfirst( strtolower( $this->getTableName() ) ),
-// 			ucfirst( strtolower( $columnName ) ),
-// 			$actual->getValue( 0, 'DATA_TYPE' ),
-// 			$this->markAdjustments['incorrectDataType']
-// 		);
-		$errorString = sprintf(
-			'column %s.%s has unexpected data type %s; check the specification again or consult with the teaching staff',
-			ucfirst( strtolower( $this->getTableName() ) ),
-			ucfirst( strtolower( $columnName ) ),
-			$actual->getValue( 0, 'DATA_TYPE' ),
-			$this->markAdjustments['incorrectDataType']
-		);
+		if ( RUN_MODE === 'staff' )
+		{
+			$errorString = sprintf(	'column %s.%s has unexpected data type %s [%+1.1f]',
+									ucfirst( strtolower( $this->getTableName() ) ),
+									ucfirst( strtolower( $columnName ) ),
+									$actual->getValue( 0, 'DATA_TYPE' ),
+									$this->markAdjustments['incorrectDataType']	);
+		}
+		else if ( RUN_MODE === 'student' )
+		{
+			$errorString = sprintf(
+				'column %s.%s has unexpected data type %s; check the specification again or consult with the teaching staff',
+				ucfirst( strtolower( $this->getTableName() ) ),
+				ucfirst( strtolower( $columnName ) ),
+				$actual->getValue( 0, 'DATA_TYPE' ),
+				$this->markAdjustments['incorrectDataType']	);
+		}
 						
 		$this->assertContains( $actual->getValue( 0, 'DATA_TYPE' ), $columnTypeList, $errorString );
 	}
@@ -770,35 +793,37 @@
 		// This is pretty unlikely in practice, but you never know...
 		if ( $columnName == '___NO_DATA___' )
 		{
-			$this->markTestSkipped( 'no columns with enumerated legal values' );
+			$this->markTestSkipped( 'all of the columns are of types that have no length' );
 		}
 	
-// 		echo "\n[[ Testing whether " . ucfirst( strtolower( $this->getTableName() ) ) . '.' . ucfirst( strtolower( $columnName ) ) . " length is ";
 		$lengthSpec = '';
-// 		if ( $maxLength == 0 )
-// 		{
-// 			$lengthSpec .= "≥ " . $minLength;
-// 		}
-// 		elseif ( $minLength == 0 )
-// 		{
-// 			$lengthSpec .= "≤ " . $maxLength;
-// 		}
-// 		elseif ( $minLength != $maxLength )
-// 		{
-// 			$lengthSpec .= $minLength . "–" . $maxLength;
-// 		}
-// 		else
-// 		{
-// 			$lengthSpec .= $maxLength;
-// 		}
-// 		
-// 		if ( $columnType === 'NUMBER' )
-// 		{
-// 			if ( $numDecimals > 0 ) // technically if could also be < 0, but this is uncommon
-// 			{
-// 				$lengthSpec .= " (including " . $numDecimals . " decimal places)";
-// 			}
-// 		}
+		if ( RUN_MODE === 'staff' )
+		{
+			if ( $maxLength == 0 )
+			{
+				$lengthSpec .= "≥ ${minLength}";
+			}
+			elseif ( $minLength == 0 )
+			{
+				$lengthSpec .= "≤ ${maxLength}";
+			}
+			elseif ( $minLength != $maxLength )
+			{
+				$lengthSpec .= "${minLength}–${maxLength}";
+			}
+			else
+			{
+				$lengthSpec .= "= ${maxLength}";
+			}
+			
+			if ( $columnType === 'NUMBER' )
+			{
+				if ( $numDecimals > 0 ) // technically it could also be < 0, but this is uncommon
+				{
+					$lengthSpec .= " (including " . $numDecimals . " decimal places)";
+				}
+			}
+		}
 		
 		self::$reporter->report( Reporter::STATUS_TEST, "[[ %s.%s length %s ]] ",
 			array( ucfirst( strtolower( $this->getTableName() ) ), ucfirst( strtolower( $columnName ) ), $lengthSpec ) );
@@ -829,22 +854,22 @@
 		
 		if ( $columnType === 'NUMBER' )
 		{
-// 			$errorString = sprintf(
-// 				'column %s.%s has incorrect length %d, %d [%+1.1f]',
-// 				ucfirst( strtolower( $this->getTableName() ) ),
-// 				ucfirst( strtolower( $columnName ) ),
-// 				$actual->getValue( 0, 'DATA_PRECISION' ),
-// 				$actual->getValue( 0, 'DATA_SCALE' ),
-// 				$this->markAdjustments['incorrectLength']
-// 			);
-			$errorString = sprintf(
-				'column %s.%s has unexpected length; check the specification again or consult with the teaching staff',
-				ucfirst( strtolower( $this->getTableName() ) ),
-				ucfirst( strtolower( $columnName ) ),
-				$actual->getValue( 0, 'DATA_PRECISION' ),
-				$actual->getValue( 0, 'DATA_SCALE' ),
-				$this->markAdjustments['incorrectLength']
-			);
+			if ( RUN_MODE === 'staff' )
+			{
+				$errorString = sprintf(	'column %s.%s has unexpected length %d, %d [%+1.1f]',
+										ucfirst( strtolower( $this->getTableName() ) ),
+										ucfirst( strtolower( $columnName ) ),
+										$actual->getValue( 0, 'DATA_PRECISION' ),
+										$actual->getValue( 0, 'DATA_SCALE' ),
+										$this->markAdjustments['incorrectLength']	);
+			}
+			else if ( RUN_MODE === 'student' )
+			{
+				$errorString = sprintf(
+					'column %s.%s has unexpected length; check the specification again or consult with the teaching staff',
+					ucfirst( strtolower( $this->getTableName() ) ),
+					ucfirst( strtolower( $columnName ) )	);
+			}
 							
 			if ( $minLength > 0 )
 			{
@@ -866,13 +891,21 @@
 			// as they should have no length specified.
 			if ( $actual->getValue( 0, 'DATA_TYPE' ) != 'CLOB' )
 			{
-				$errorString = sprintf(
-					'column %s.%s has incorrect length %d [%+1.1f]',
-					ucfirst( strtolower( $this->getTableName() ) ),
-					ucfirst( strtolower( $columnName ) ),
-					$actual->getValue( 0, 'CHAR_LENGTH' ),
-					$this->markAdjustments['incorrectLength']
-				);
+				if ( RUN_MODE === 'staff' )
+				{
+					$errorString = sprintf(	'column %s.%s has unexpected length %d [%+1.1f]',
+											ucfirst( strtolower( $this->getTableName() ) ),
+											ucfirst( strtolower( $columnName ) ),
+											$actual->getValue( 0, 'CHAR_LENGTH' ),
+											$this->markAdjustments['incorrectLength']	);
+				}
+				else if ( RUN_MODE === 'student' )
+				{
+					$errorString = sprintf(
+						'column %s.%s has unexpected length; check the specification again or consult with the teaching staff',
+						ucfirst( strtolower( $this->getTableName() ) ),
+						ucfirst( strtolower( $columnName ) )	);
+				}
 								
 				if ( $maxLength > 0 )
 				{
@@ -888,6 +921,11 @@
 	}
 	
 	
+	/****************************************************************************************************
+	 *  THE REMAINING ASSERT() METHODS ARE NOT INTENDED TO BE CALLED IN "STUDENT" RUN MODE.
+	 ****************************************************************************************************/
+	
+	
 	/**
 	 *	Assert that a column allows or disallows nulls.
 	 *
@@ -898,8 +936,7 @@
 	 */
 	protected function assertColumnNullability( $columnName, $columnNullability )
 	{
-// 		echo "\n[[ Testing whether " . ucfirst( strtolower( $this->getTableName() ) ) . '.' . ucfirst( strtolower( $columnName ) ) . " nullability is " . $columnNullability . " ]]\n";
-		self::$reporter->report( Reporter::STATUS_TEST, "[[ %s.%s nulls: %s ]] ",
+		self::$reporter->report( Reporter::STATUS_TEST, "[[ %s.%s nullability should be %s ]] ",
 			array( ucfirst( strtolower( $this->getTableName() ) ), ucfirst( strtolower( $columnName ) ), $columnNullability ) );
 		
 		$queryString = sprintf(
@@ -909,17 +946,14 @@
 			strtoupper( $this->getTableName() ),
 			strtoupper( $columnName )
 		);
-//	 	echo "$queryString\n";
 		
 		$actual = $this->getConnection()->createQueryTable( $this->getTableName() . '_' . $columnName, $queryString );
 		
-		$errorString = sprintf(
-			'column %s.%s has incorrect nullability "%s" [%+1.1f]',
-			ucfirst( strtolower( $this->getTableName() ) ),
-			ucfirst( strtolower( $columnName ) ),
-			$actual->getValue( 0, 'NULLABLE' ),
-			$this->markAdjustments['incorrectNullability']
-		);
+		$errorString = sprintf(	'column %s.%s has incorrect nullability "%s" [%+1.1f]',
+								ucfirst( strtolower( $this->getTableName() ) ),
+								ucfirst( strtolower( $columnName ) ),
+								$actual->getValue( 0, 'NULLABLE' ),
+								$this->markAdjustments['incorrectNullability']	);
 		
 		$this->assertEquals( $actual->getValue( 0, 'NULLABLE' ), $columnNullability, $errorString );
 	}
@@ -939,8 +973,8 @@
 		{
 			$this->markTestSkipped( 'no columns with enumerated legal values' );
 		}
-	
-// 		echo "\n[[ Testing whether " . ucfirst( strtolower( $this->getTableName() ) ) . '.' . ucfirst( strtolower( $columnName ) ) . " accepts legal value [" . $legalValue . "] ]]\n";
+		
+		// Should never be called in student run mode.
 		self::$reporter->report( Reporter::STATUS_TEST, "[[ %s.%s accepts “%s” ]] ",
 			array( ucfirst( strtolower( $this->getTableName() ) ), ucfirst( strtolower( $columnName ) ), $legalValue ) );
 		
@@ -980,7 +1014,6 @@
 			$this->markTestSkipped( 'no columns with enumerated illegal values' );
 		}
 	
-// 		echo "\n[[ Testing whether " . ucfirst( strtolower( $this->getTableName() ) ) . '.' . ucfirst( strtolower( $columnName ) ) . " rejects illegal value [" . $illegalValue . "] using the column length (implicit) ]]\n";
 		self::$reporter->report( Reporter::STATUS_TEST, "[[ %s.%s rejects “%s” using column length (implicit) ]] ",
 			array( ucfirst( strtolower( $this->getTableName() ) ), ucfirst( strtolower( $columnName ) ), $illegalValue ) );
 		
@@ -1037,7 +1070,6 @@
 			$this->markTestSkipped( 'no columns with enumerated illegal values' );
 		}
 	
-// 		echo "\n[[ Testing whether " . ucfirst( strtolower( $this->getTableName() ) ) . '.' . ucfirst( strtolower( $columnName ) ) . " rejects illegal value [" . $illegalValue . "] using a CHECK constraint ]]\n";
 		self::$reporter->report( Reporter::STATUS_TEST, "[[ %s.%s rejects “%s” using CHECK ]] ",
 			array( ucfirst( strtolower( $this->getTableName() ) ), ucfirst( strtolower( $columnName ) ), $illegalValue ) );
 		
@@ -1204,7 +1236,6 @@
 	 */
 	public function assertPKExists()
 	{
-// 		echo "\n[[ Testing whether " . ucfirst( strtolower( $this->getTableName() ) ) . " table primary key constraint exists ]]\n";
 		self::$reporter->report( Reporter::STATUS_TEST, "[[ %s PK ]] ",
 			array( ucfirst( strtolower( $this->getTableName() ) ) ) );
 		
@@ -1242,13 +1273,6 @@
 		$tableName = $this->getTableName() . '_PK_cols';
 		$expected = $this->getPKColumnListAsDataSet( $tableName );
 		
-// 		echo "\n[[ Testing whether " . ucfirst( strtolower( $this->getTableName() ) ) .
-// 			" table primary key constraint contains (only) the column";
-// 		if ( count( $this->getPKColumnlist() ) > 1 )
-// 		{
-// 			echo "s";
-// 		}
-// 		echo " " . ucwords( strtolower( implode( ', ', $this->getPKColumnList() ) ) ) . " ]]\n";
 		self::$reporter->report( Reporter::STATUS_TEST, "[[ %s PK: %s ]] ",
 			array( ucfirst( strtolower( $this->getTableName() ) ), ucwords( strtolower( implode( ', ', $this->getPKColumnList() ) ) ) ) );
 
@@ -1400,8 +1424,6 @@
 				break;
 		}
 	
-// 		echo "\n[[ Testing whether " . ucfirst( strtolower( $this->getTableName() ) ) .
-// 			" table " . $longType . " constraint " . $constraintName . " is explicitly named ]]\n";
 		self::$reporter->report( Reporter::STATUS_TEST, "[[ %s %s constraint %s ]] ",
 			array( ucfirst( strtolower( $this->getTableName() ) ), $longType, $constraintName ) );