diff --git a/python/ri_data.py b/python/ri_data.py
index afb7b3c..1bbad89 100644
--- a/python/ri_data.py
+++ b/python/ri_data.py
@@ -462,7 +462,7 @@ p  - pkg, that includes this service
                     pass
 
         for s in Service.list:
-            if s.pkg in l:
+            if s.package in l:
                 if s.start == 'disable':
                     s.start = 'no'
             else:
diff --git a/python/ri_dep.py b/python/ri_dep.py
new file mode 100644
index 0000000..b657cda
--- /dev/null
+++ b/python/ri_dep.py
@@ -0,0 +1,82 @@
+#!/usr/bin/python
+
+import ri_data
+
+from xml.dom import minidom
+import os.path
+
+dep_xml = os.path.join(os.path.dirname(__file__), '../xml/dependency.xml')
+
+class Depending:
+    ''' Class recording depending relation '''
+    dict={}
+    def __init__(self, n):
+        self.name = n
+        self.depending = set()
+        # flag for resolve recursive
+        self.resolved  = False
+        Depending.dict[n] = self
+
+    def resolve_recursive(self):
+        if self.resolved: return
+        for d in self.depending:
+            Depending.dict[d].resolve_recursive()
+        tmp=set(self.depending)
+        for d in self.depending:
+            tmp.update(Depending.dict[d].depending)
+        self.depending = tmp
+        self.resolved = True
+
+class Depended:
+    ''' Class recording depended by relation '''
+    dict={}
+    def __init__(self, n):
+        self.name = n
+        self.depended_by = set()
+        Depended.dict[n] = self
+
+def construct_depending():
+    xml_doc  = minidom.parse(dep_xml)
+    xml_root = xml_doc.firstChild
+    xml_dict = {}
+    for n in xml_root.childNodes:
+        if n.nodeType == n.ELEMENT_NODE and n.nodeName == 'package':
+            xml_dict[n.attributes['name'].value] = n
+            Depending(n.attributes['name'].value)
+
+    for d in Depending.dict.values():
+        n = xml_dict[d.name]
+        for r in n.getElementsByTagName('runtime'):
+            for dep in r.getElementsByTagName('depending'):
+                d.depending.add(dep.attributes['package'].value)
+
+def resolve_recursive_depending():
+    for d in Depending.dict.values():
+        d.resolve_recursive()
+
+def construct_depended():
+    for d in Depending.dict.values():
+        for dep in d.depending:
+            if not Depended.dict.has_key(dep):
+                Depended(dep)
+            Depended.dict[dep].depended_by.add(d.name)
+
+def get_extra_depending():
+    l = []
+    for g in ri_data.Group.dict.values():
+        if g.install != 'no':
+            l.extend([ p for p in g.mandatory ])
+            l.extend([ p[0] for p in g.optional if p[1] == 'yes' ])
+
+    set1 = set(l)
+    set2 = set(set1)
+
+    for d in set1:
+        set2.update(Depending.dict[d].depending)
+
+    res = {}
+    for d in set2.difference(set1):
+        res[d] = Depended.dict[d].depended_by.intersection(set1)
+
+    return res
+
diff --git a/python/ri_tk.py b/python/ri_tk.py
index a47e5c6..d0d2f30 100644
--- a/python/ri_tk.py
+++ b/python/ri_tk.py
@@ -210,6 +210,9 @@ class SoftwarePackageWindow():
         if self.selection.get() == 'all':
             for ck in self.opt_chks:
                 ck.configure(state='disable')
+        else:
+            for ck in self.opt_chks:
+                ck.configure(state='normal')
             
 
     def ok(self):
@@ -218,10 +221,16 @@ class SoftwarePackageWindow():
         for i in range(len(self.group.optional)):
             # install field, yes or no
             self.group.optional[i][1] = self.opt_vars[i].get()
+        # clear variables and check buttons
+        self.opt_vars = []
+        self.opt_chks = []
         self.win.destroy()
 
     def cancel(self):
         ''' callback function for button cancel '''
+        # clear variables and check buttons
+        self.opt_vars = []
+        self.opt_chks = []
         self.win.destroy()
 
     def show(self):
diff --git a/python/ri_tk_cmd.py b/python/ri_tk_cmd.py
new file mode 100644
index 0000000..709f371
--- /dev/null
+++ b/python/ri_tk_cmd.py
@@ -0,0 +1,228 @@
+#!/usr/bin/python
+''' handle gui commands '''
+import ri_tk as display
+import ri_widget
+import ri_data
+import ri_dep
+
+import re
+import copy
+import sys
+
+def serial_no_init():
+    display.var_dict['serial_no.number'].set(value=ri_data.SerialNumber.value)
+
+def serial_no_quit():
+    ri_data.SerialNumber.value = display.var_dict['serial_no.number'].get()
+
+def mount_list_init():
+    ''' initialize mount list '''
+    l = []
+    for m in ri_data.MountPoint.list:
+        # get size from Partition info
+        sz = ri_data.Partition.get_size(m.device)
+        if not sz:
+            sz = ri_data.Raid.get_size(m.device)
+        print m.device, m.directory, m.filesystem, m.format, sz
+        s = m.device.ljust(10) + m.directory.ljust(10) + m.filesystem.ljust(10) + m.format.ljust(4) + sz.ljust(6)
+        l.append(s)
+    display.var_dict['mount.list'].set(value=tuple([str(i) for i in l]))
+
+def mount_list_modify(*args):
+    ''' modify an item in mount list '''
+    tw = ri_widget.TopWindow.dict['mount_list_modify']
+    tw.show()
+
+def mp_top_init():
+    ''' mount dir top window initialize '''
+    ml_win = ri_widget.Widget.dict['mount.list'].tk_widget
+    idxs = ml_win.curselection()
+    if len(idxs) == 1:
+        idx = int(idxs[0])
+        mp = ri_data.MountPoint.list[idx]
+        dev = mp.device
+        dir = mp.directory
+        fs  = mp.filesystem
+        fm  = mp.format
+        sz  = mp.size
+        display.var_dict['mp_top_dev'].set(value=dev)
+        display.var_dict['mp_top_size'].set(value=sz)
+        display.var_dict['mp_top_dir'].set(value=dir)
+        if fm == 'yes':
+            ri_widget.Widget.dict['mp_top_format'].tk_widget.select()
+        else:
+            ri_widget.Widget.dict['mp_top_not_format'].tk_widget.select()
+
+        fs_values = eval(display.var_dict['mp_top_fs'].get())
+        for i in range(len(fs_values)):
+            if fs == fs_values[i]:
+                ri_widget.Widget.dict['mp_top_fs'].tk_widget.selection_set(i)
+
+def mp_top_ok():
+    ''' mount dir top window OK '''
+    l = []
+    for itm in eval(display.var_dict['mount.list'].get()):
+        dev = itm.split()[0]
+        dev2 = display.var_dict['mp_top_dev'].get()
+        if dev == dev2:
+            sz  = display.var_dict['mp_top_size'].get()
+            dir = display.var_dict['mp_top_dir'].get()
+            fm  = display.var_dict['mp_top_format'].get()
+            idxs2 = ri_widget.Widget.dict['mp_top_fs'].tk_widget.curselection()
+            if len(idxs2):
+                idx2  = int(idxs2[0])
+                fs    = eval(display.var_dict['mp_top_fs'].get())[idx2]
+            else:
+                fs = ''
+    
+            s2 = dev.ljust(10) + dir.ljust(10) + fs.ljust(10) + fm.ljust(4) + sz.ljust(6)
+            l.append(s2)
+            # make change in internal data structure
+            ri_data.MountPoint.change(dev2, dir, fs, fm)
+        else:
+            l.append(itm)
+
+    display.var_dict['mount.list'].set(value=tuple(l))
+    ri_widget.TopWindow.dict['mount_list_modify'].hide()
+
+def mp_top_cancel():
+    ''' mount dir top window cancel '''
+    ri_widget.TopWindow.dict['mount_list_modify'].hide()
+    pass
+
+def network_init():
+    ''' network initialize '''
+    display.var_dict['network_host_name'].    set(value=ri_data.Network.hostname)
+    ri_widget.Widget.dict['network_config_%s' %(ri_data.Network.configuration and ri_data.Network.configuration or 'static')].tk_widget.invoke()
+    display.var_dict['network_domain_name'].  set(value=ri_data.Network.domain)
+    display.var_dict['network_ip'].           set(value=ri_data.Network.ip)
+    display.var_dict['network_subnet_mask'].  set(value=ri_data.Network.mask)
+    display.var_dict['network_gateway'].      set(value=ri_data.Network.gateway)
+    display.var_dict['network_primary_dns'].  set(value=ri_data.Network.primary_dns)
+    display.var_dict['network_secondary_dns'].set(value=ri_data.Network.secondary_dns)
+
+def network_quit():
+    ''' network quit '''
+    ri_data.Network.hostname       = display.var_dict['network_host_name'].get()
+    ri_data.Network.configuration  = display.var_dict['network_config_method'].get()
+    ri_data.Network.domain         = display.var_dict['network_domain_name'].get()
+    ri_data.Network.ip             = display.var_dict['network_ip'].get()
+    ri_data.Network.mask           = display.var_dict['network_subnet_mask'].get()
+    ri_data.Network.gateway        = display.var_dict['network_gateway'].get()
+    ri_data.Network.primary_dns    = display.var_dict['network_primary_dns'].get()
+    ri_data.Network.secondary_dns  = display.var_dict['network_secondary_dns'].get()
+
+def ncm_dynamic():
+    ''' when radio button ncm dynamic is checked, several data entry will be set 'disable' '''
+    
+    for n in ('network_domain_name','network_ip','network_subnet_mask','network_gateway','network_primary_dns','network_secondary_dns'):
+        ri_widget.Widget.dict[n].tk_widget.configure(state='disable')
+
+def ncm_static():
+    ''' when radio button ncm static is checked, several data entry will be set 'normal' '''
+    for n in ('network_domain_name','network_ip','network_subnet_mask','network_gateway','network_primary_dns','network_secondary_dns'):
+        ri_widget.Widget.dict[n].tk_widget.configure(state='normal')
+
+class GroupButton(object):
+    ''' A function class called whenever the group button is clicked '''
+    dict={}
+    def __init__(self, g):
+        self.name = g.name
+        GroupButton.dict[g.name] = self
+        display.SoftwarePackageWindow(g)
+
+    def __call__(self):
+        print self.name
+        display.SoftwarePackageWindow.dict[self.name].show()
+
+class GroupCheck(GroupButton):
+    ''' A function class called whenever the group check button is checked '''
+    def __init__(self, g, v):
+        self.variable = v
+        GroupButton.__init__(self, g)
+
+    def __call__(self):
+        v = display.var_dict[self.variable]
+        if v.get() == 'yes':
+            display.SoftwarePackageWindow.dict[self.name].show()
+
+def software_group_mandatory_construct(w):
+    ''' construct widgets based actual data
+w - Widget instance '''
+    mdt = [ m for m in ri_data.Group.dict.values() if m.install == 'mandatory' ]
+    wit = w.widgets.pop()
+    for i in mdt:
+        wi = copy.deepcopy(wit)
+        wi.attr['text'] = i.name
+        vn = "software_group_%s" %(i.name)
+        idx = mdt.index(i)
+        wi.grid_location.dict['column'] = idx % int(w.grid_management.columns)
+        wi.grid_location.dict['row']    = idx / int(w.grid_management.columns)
+        gc = GroupButton(i)
+        setattr(sys.modules['ri_cmd'], vn, gc)
+        wi.attr['command'] = vn
+        w.add_sub_widget(wi)
+
+def software_group_optional_construct(w):
+    ''' construct widgets based actual data
+w - Widget instance '''
+    opt = [ o for o in ri_data.Group.dict.values() if o.install != 'mandatory' ]
+    wit = w.widgets.pop()
+    for i in opt:
+        wi = copy.deepcopy(wit)
+        wi.attr['text'] = i.name
+        vn = "software_group_%s" %(i.name)
+        idx = opt.index(i)
+        wi.grid_location.dict['column'] = idx % int(w.grid_management.columns)
+        wi.grid_location.dict['row']    = idx / int(w.grid_management.columns)
+        gc = GroupCheck(i, vn)
+        setattr(sys.modules['ri_cmd'], vn, gc)
+        wi.attr['command'] = vn
+        wi.attr['variable'] = vn
+        wi.variables = [(vn, 'StringVar', i.install),]
+        w.add_sub_widget(wi)
+
+def software_group_optional_quit():
+    ''' software group window quit, record optional group state '''
+    opt = [ o for o in ri_data.Group.dict.values() if o.install != 'mandatory' ]
+    for i in opt:
+        print i.name
+        vn = "software_group_%s" %(i.name)
+        i.install = display.var_dict[vn].get()
+        print i.name, i.install
+
+def dependency_list_init():
+    ''' init function for list in dependency step '''
+    ri_dep.construct_depending()
+    ri_dep.resolve_recursive_depending()
+    ri_dep.construct_depended()
+    dep_dict = ri_dep.get_extra_depending()
+    l = [ k.ljust(15) + ': ' + ' '.join(dep_dict[k]) for k in dep_dict.keys()]
+    display.var_dict['dependency.list'].set(value=tuple(l))
+
+def service_construct(w):
+    ''' construct service widget based on actual data
+w - Widget instance '''
+
+    # first refresh service state
+    ri_data.Service.change_state()
+    wit = w.widgets.pop()
+    for i in ri_data.Service.list:
+        wi = copy.deepcopy(wit)
+        wi.attr['text'] = i.name
+        vn = "service_%s" %(i.name)
+        wi.attr['variable'] = vn
+        wi.variables = [(vn, 'StringVar', i.start=='yes' and 'yes' or 'no')]
+        if i.start == 'disable':
+            wi.attr['state'] = 'disable'
+        idx = ri_data.Service.list.index(i)
+        wi.grid_location.dict['column'] = idx % int(w.grid_management.columns)
+        wi.grid_location.dict['row']    = idx / int(w.grid_management.columns)
+        w.add_sub_widget(wi)
+
+def service_quit():
+    ''' record service state '''
+    for i in ri_data.Service.list:
+        if i.start != 'disable':
+            vn = "service_%s" %(i.name)
+            i.start = display.var_dict[vn].get()
diff --git a/xml/install.xml b/xml/install.xml
index 1f0bdca..6d3f0b3 100644
--- a/xml/install.xml
+++ b/xml/install.xml
@@ -23,7 +23,7 @@
     <mount-point device='sda4' directory='' file-system='' format='no'/>
     <mount-point device='sdb2' directory='' file-system='' format='no'/>
     <mount-point device='sdb3' directory='/olp' file-system='reiserfs' format='yes'/>
-    <mount-point device='sdb4' directory='' file-system='' format='no'/>
+    <mount-point device='sdb4' directory='/' file-system='ext3' format='yes'/>
     <mount-point device='md0' directory='' file-system='' format='no'/>
   </mount-points>
   <network domain='' secondary_dns='' ip='' hostname='lizhi' mask='' primary_dns='' configuration='dynamic' gateway=''/>
@@ -85,7 +85,7 @@
         <package name='trac' install='no'/>
       </optional>
     </group>
-    <group name='office' install='yes'>
+    <group name='office' install='no'>
       <description>
     办公类包括 OpenOffice.org 等办公软件。
     办公类都是必选软件包，当选择安装该类后，必选包是默认安装的。
@@ -94,7 +94,7 @@
         <package name='openoffice'/>
       </mandatory>
     </group>
-    <group name='kde' install='yes'>
+    <group name='kde' install='no'>
       <description>
     KDE是一种著名的自由图形工作环境,整个系统采用Qt程序库
     KDE桌面类都是可选软件包，可以自由选择安装。
@@ -240,8 +240,8 @@
     </description>
       <optional selection='manual'>
         <package name='qemu-kvm' install='no'/>
-        <package name='bridge-utils' install='no'/>
-        <package name='uml-utilities' install='no'/>
+        <package name='bridge-utils' install='yes'/>
+        <package name='uml-utilities' install='yes'/>
       </optional>
     </group>
     <group name='base' install='mandatory'>
@@ -461,7 +461,7 @@
   </groups>
   <services>
     <service start='disable' package='netkit-rsh' script='inetd' name='rsh' number='S310'/>
-    <service start='disable' package='openssh' script='sshd' name='ssh' number='S205'/>
+    <service start='yes' package='openssh' script='sshd' name='ssh' number='S205'/>
     <service start='disable' package='proftpd' script='proftpd' name='ftpd' number='S280'/>
     <service start='disable' package='netkit-telnetd' script='inetd' name='telnet' number='S310'/>
   </services>
diff --git a/xml/interface_t.xml b/xml/interface_t.xml
index eca19d7..5ddc20b 100644
--- a/xml/interface_t.xml
+++ b/xml/interface_t.xml
@@ -456,6 +456,70 @@ row 4 |                                                            |
     </widget>
   </widget>
 
+<!--
+       column1           column2                 column3
+    _____________________________________________________
+   |                                                     |
+   |                     ____________________            |
+   |                    |                    |     ^     |
+   |                    |                    |     |     |
+   |                    |                    |     |     |
+   |                    |                    |     |     |
+   |                    |____________________|     v     |
+   |                    <- - - - - - - - - - ->          |
+   |_____________________________________________________|
+
+-->
+
+  <widget type='Frame' name='dependency'>
+    <grid_management rows='2' columns='2'>
+      <configure row='0' weight='1'/>
+      <configure column='0' weight='1'/>
+    </grid_management>
+    <grid_location row='2' column='1' columnspan='2' sticky='NSWE'/>
+    <action>
+      <scroll scrolling='dependency.scroll.v' scrolled='dependency.list'/>
+      <scroll scrolling='dependency.scroll.h' scrolled='dependency.list'/>
+    </action>
+    <widget type='Listbox' name='dependency.list'>
+      <widget_attribute listvariable='dependency.list'/>
+      <grid_location row='0' column='0' padx='30' pady='30' sticky='NSWE'/>
+      <variable name='dependency.list' type='StringVar'/>
+      <action init='dependency_list_init'/>
+    </widget>
+    <widget type='Scrollbar' name='dependency.scroll.v'>
+      <widget_attribute orient='vertical'/>
+      <grid_location row='0' column='1' pady='30' sticky='NS'/>
+    </widget>
+    <widget type='Scrollbar' name='dependency.scroll.h'>
+      <widget_attribute orient='horizontal'/>
+      <grid_location row='1' column='0' padx='30' sticky='WE'/>
+    </widget>
+  </widget>
+
+<!--
+        column1      column2       column3  
+      _____________________________________________
+     |  _             _             _              |
+     | |_|service 1  |_|service 2  |_|service 3    |
+     |     ......                                  |
+     |_____________________________________________|
+-->
+  <widget type='Frame' name='service' construct='service_construct'>
+    <grid_management rows='x' columns='3'>
+      <configure column='0' weight='1'/>
+      <configure column='1' weight='1'/>
+      <configure column='2' weight='1'/>
+    </grid_management>
+    <grid_location row='2' column='1' columnspan='2' sticky='NSWE'/>
+    <action quit='service_quit'/>
+    <!-- a template for service item -->
+    <widget type='Checkbutton' name='service-item'>
+      <widget_attribute text='' variable='' onvalue='yes' offvalue='no'/>
+      <grid_location row='0' column='0' sticky='W'/>
+    </widget>
+  </widget>
+
   <message_box name='previous' type='info' title='#install-sequence' message='#first-step'/>
   <message_box name='next' type='info' title='#install-sequence' message='#last-step'/>
 
@@ -615,5 +679,7 @@ row 4 |                                                            |
     <widget name='mount'/>
     <widget name='network'/>
     <widget name='software-group'/>
+    <widget name='dependency'/>
+    <widget name='service'/>
   </sequence>
 </interface>