diff --git a/account_credit_control/wizard/credit_control_mailer.py b/account_credit_control/wizard/credit_control_mailer.py
index d64197612..73751f615 100644
--- a/account_credit_control/wizard/credit_control_mailer.py
+++ b/account_credit_control/wizard/credit_control_mailer.py
@@ -22,14 +22,15 @@ from openerp.osv.orm import  TransientModel, fields
 from openerp.osv.osv import except_osv
 from openerp.tools.translate import _
 
+
 class CreditControlMailer(TransientModel):
-    """Change the state of lines in mass"""
+    """Send emails for each selected credit control lines."""
 
     _name = "credit.control.mailer"
     _description = """Mass credit line mailer"""
     _rec_name = 'id'
 
-    _columns = {'mail_all': fields.boolean('Mail all ready lines')}
+    _columns = {'mail_all': fields.boolean('Send an email for all "To Send" lines.')}
 
 
     def _get_lids(self, cursor, uid, mail_all, active_ids, context=None):
@@ -47,18 +48,26 @@ class CreditControlMailer(TransientModel):
 
 
     def mail_lines(self, cursor, uid, wiz_id, context=None):
+        assert not (isinstance(run_id, list) and len(run_id) > 1), \
+                "run_id: only one id expected"
         comm_obj = self.pool.get('credit.control.communication')
-        context = context or {}
+        if context is None:
+            context = {}
+        assert not (isinstance(wiz_id, list) and len(wiz_id) > 1), \
+                "wiz_id: only one id expected"
         if isinstance(wiz_id, list):
             wiz_id = wiz_id[0]
         current = self.browse(cursor, uid, wiz_id, context)
         lines_ids = context.get('active_ids')
 
         if not lines_ids and not current.mail_all:
-            raise except_osv(_('Not lines ids are selected'),
-                             _('You may check "Mail all ready lines"'))
+            raise except_osv(_('Error'),
+                             _('No lines are selected. You may want to activate '
+                               '"Send an email for all "To Send" lines."'))
+
         filtered_ids = self._get_lids(cursor, uid, current.mail_all, lines_ids, context)
         comms = comm_obj._generate_comm_from_credit_line_ids(cursor, uid, filtered_ids,
                                                              context=context)
         comm_obj._generate_mails(cursor, uid, comms, context=context)
         return {}
+
diff --git a/account_credit_control/wizard/credit_control_marker.py b/account_credit_control/wizard/credit_control_marker.py
index 8960852bd..7397a343b 100644
--- a/account_credit_control/wizard/credit_control_marker.py
+++ b/account_credit_control/wizard/credit_control_marker.py
@@ -27,11 +27,11 @@ class CreditControlMarker(TransientModel):
 
     _name = "credit.control.marker"
     _description = """Mass marker"""
-    _columns = {'name': fields.selection([('to_be_sent', 'To be sent'),
+    _columns = {'name': fields.selection([('to_be_sent', 'To send'),
                                           ('sent', 'Done')],
                                           'Mark as', required=True),
 
-                'mark_all': fields.boolean('Mark all draft lines')}
+                'mark_all': fields.boolean('Change status of all draft lines')}
 
     _defaults = {'name': 'to_be_sent'}
 
@@ -49,27 +49,29 @@ class CreditControlMarker(TransientModel):
         line_obj = self.pool.get('credit.control.line')
         if not state:
             raise ValueError(_('state can not be empty'))
-        line_obj.write(cursor, uid, filtered_ids, {'state': state})
+        line_obj.write(cursor, uid, filtered_ids, {'state': state}, context=context)
         return filtered_ids
 
-
-
     def mark_lines(self, cursor, uid, wiz_id, context=None):
         """Write state of selected credit lines to the one in entry
         done credit line will be ignored"""
-        context = context or {}
+        if context is None:
+            context = {}
+        assert not (isinstance(wiz_id, list) and len(wiz_id) > 1), \
+                "wiz_id: only one id expected"
         if isinstance(wiz_id, list):
             wiz_id = wiz_id[0]
         current = self.browse(cursor, uid, wiz_id, context)
         lines_ids = context.get('active_ids')
 
         if not lines_ids and not current.mark_all:
-            raise except_osv(_('Not lines ids are selected'),
-                             _('You may check "Mark all draft lines"'))
+            raise except_osv(_('Error'),
+                             _('No lines are selected. You may want to activate '
+                               '"Change status of all draft lines"'))
         filtered_ids = self._get_lids(cursor, uid, current.mark_all, lines_ids, context)
         if not filtered_ids:
-            raise except_osv(_('No lines will be changed'),
-                             _('All selected lines are allready done'))
+            raise except_osv(_('Information'),
+                             _('No lines will be changed. All the selected lines are already done'))
 
         # hook function a simple write should be enought
         self._mark_lines(cursor, uid, filtered_ids, current.name, context)
@@ -81,3 +83,4 @@ class CreditControlMarker(TransientModel):
                  'view_id': False,
                  'res_model': 'credit.control.line',
                  'type': 'ir.actions.act_window'}
+
diff --git a/account_credit_control/wizard/credit_control_marker_view.xml b/account_credit_control/wizard/credit_control_marker_view.xml
index 6898c1ca1..9ba1c6ddd 100644
--- a/account_credit_control/wizard/credit_control_marker_view.xml
+++ b/account_credit_control/wizard/credit_control_marker_view.xml
@@ -7,13 +7,13 @@
       <field name="type">form</field>
       <field name="arch" type="xml">
         <form> <!-- editable="bottom" -->
-          <separator string="This wizard will mark selected  draft lines to the selected state. Done Lines will be ignored " colspan="4"/>
+          <separator string="This wizard will change the state of the selected draft lines. Done Lines will be ignored " colspan="4"/>
           <newline/>
           <field name="name"/>
           <field name="mark_all"/>
           <newline/>
           <group colspan="4">
-            <button name="mark_lines" string="Mark lines" type="object" icon="gtk-execute"/>
+            <button name="mark_lines" string="Mark Lines" type="object" icon="gtk-execute"/>
             <button special="cancel" string="Cancel" icon='gtk-cancel'/>
           </group>
         </form>
@@ -30,14 +30,14 @@
                 id="open_credit_line_marker_wizard_menu_action"/>
 
     <record id="open_credit_line_marker_wizard" model="ir.actions.act_window">
-      <field name="name">Mark lines</field>
+      <field name="name">Change Lines' State</field>
       <field name="res_model">credit.control.marker</field>
       <field name="src_model">credit.control.line</field>
       <field name="view_type">form</field>
       <field name="view_mode">form</field>
       <field name="view_id" ref="credit_line_marker_form"/>
       <field name="target">new</field>
-      <field name="help">Mark all lines. You can the send marked lines</field>
+      <field name="help">Change the state of the selected lines.</field>
     </record>
 
   </data>
diff --git a/account_credit_control/wizard/credit_control_printer.py b/account_credit_control/wizard/credit_control_printer.py
index 55ff06590..b047363b7 100644
--- a/account_credit_control/wizard/credit_control_printer.py
+++ b/account_credit_control/wizard/credit_control_printer.py
@@ -30,12 +30,16 @@ class CreditControlPrinter(TransientModel):
     _name = "credit.control.printer"
     _rec_name = 'id'
     _description = """Mass printer"""
-    _columns = {'mark_as_sent': fields.boolean('Mark lines as send',
-                                               help="Lines to emailed will be ignored"),
-                'print_all': fields.boolean('Print all ready lines'),
-                'report_file': fields.binary('Generated Report'),
+    _columns = {'mark_as_sent': fields.boolean('Mark lines as sent',
+                                               help="Only manual lines will be marked."),
+                'print_all': fields.boolean('Print all "To send" lines'),
+                'report_file': fields.binary('Generated Report', readonly=True),
                 'state': fields.char('state', size=32)}
 
+    _defaults = {
+        'mark_as_sent': True,
+    }
+
     def _get_lids(self, cursor, uid, print_all, active_ids, context=None):
         """get line to be marked filter done lines"""
         # TODO Dry with mailer maybe in comm
@@ -52,14 +56,18 @@ class CreditControlPrinter(TransientModel):
 
     def print_lines(self, cursor, uid, wiz_id, context=None):
         comm_obj = self.pool.get('credit.control.communication')
-        context = context or {}
+        if context is None:
+            context = {}
+        assert not (isinstance(wiz_id, list) and len(wiz_id) > 1), \
+                "wiz_id: only one id expected"
         if isinstance(wiz_id, list):
             wiz_id = wiz_id[0]
         current = self.browse(cursor, uid, wiz_id, context)
         lines_ids = context.get('active_ids')
         if not lines_ids and not current.print_all:
-            raise except_osv(_('Not lines ids are selected'),
-                             _('You may check "Print all ready lines"'))
+            raise except_osv(_('Error'),
+                             _('No lines are selected. You may want to activate'
+                               ' "Print all "To send" lines."'))
         if current.print_all:
             filtered_ids = self._get_lids(cursor, uid, current.print_all, lines_ids, context)
         else:
diff --git a/account_credit_control/wizard/credit_control_printer_view.xml b/account_credit_control/wizard/credit_control_printer_view.xml
index 4c1906c64..67176c0b9 100644
--- a/account_credit_control/wizard/credit_control_printer_view.xml
+++ b/account_credit_control/wizard/credit_control_printer_view.xml
@@ -7,7 +7,7 @@
       <field name="type">form</field>
       <field name="arch" type="xml">
         <form> <!-- editable="bottom" -->
-          <separator colspan="4" string="This wizard will print all manual lines. Mark lines, lines will pass lines to state done. Lines with canal email  will not be passed to state done"/>
+          <separator colspan="4" string="This wizard will print the selected manual lines. Mark lines, lines will pass lines to state done. Lines with canal email will not be passed to state done"/>
           <newline/>
           <field name="mark_as_sent"/>
           <field name="print_all"/>
@@ -16,7 +16,7 @@
           <field name="state" invisible="1" />
           <newline/>
           <group colspan="4">
-            <button name="print_lines" string="Print lines" type="object" icon="gtk-execute"/>
+            <button name="print_lines" string="Print Lines" type="object" icon="gtk-execute"/>
             <button special="cancel" string="Cancel" icon='gtk-cancel'/>
           </group>
         </form>
@@ -33,14 +33,14 @@
                 id="open_credit_line_printer_wizard_menu_action"/>
 
     <record id="open_credit_line_printer_wizard" model="ir.actions.act_window">
-      <field name="name">Print lines</field>
+      <field name="name">Print Lines</field>
       <field name="res_model">credit.control.printer</field>
       <field name="src_model">credit.control.line</field>
       <field name="view_type">form</field>
       <field name="view_mode">form</field>
       <field name="view_id" ref="credit_line_printer_form"/>
       <field name="target">new</field>
-      <field name="help">Print all lines</field>
+      <field name="help">Print selected lines</field>
     </record>
 
   </data>