diff --git a/script/config.sh b/script/config.sh
index bb378c0..22f448f 100644
--- a/script/config.sh
+++ b/script/config.sh
@@ -14,11 +14,39 @@ export ERASEALL=0
 # Keep it unique from other distribution.
 export LVROOTNAME="anko"
 
+# Suffix of the optional logical volumes. 
+# If you want to have optional OVs, set USELVEXT# to 1. 
+# Then, the suffix will be added to the LVROOTNAME. 
+# For example, Assume you have setting below : 
+# LVROOTNAME="anko"
+# USELVEXT1=1
+# LVEXT1SUFFIX="_home"
+# USELVEXT2=0
+# LVEXT2SUFFIX="_var"
+# You will have
+# anko
+# anko_home
+# You will not have anko_var because the USELVEXT2=0.
+export USELVEXT1=0
+export LVEXT1SUFFIX="_home"
+export USELVEXT2=0
+export LVEXT2SUFFIX="_var"
+
 # Logical volume size of the Linux installation.
 # 30% mean, new logical volume will use 30% of the free space 
 # in the LVM volume group. For example, assume the free space is 100GB, 
 # and LVROOTSIZE is 30%FREE. Script will create 30GB logical volume.  
-export LVROOTSIZE="50%FREE"
+# Note that the order of the volume creation is : 
+# 1. EFI if needed
+# 2. SWAP
+# 3. LVROOT
+# 4. LVEXT1 if needed
+# 5. LVEXT2 if needed
+export LVROOTSIZE="10%FREE"
+
+# Logical volume size of the optional volumes. 
+export LVEXT1SIZE="90%FREE"
+export LVEXT2SIZE="100%FREE"
 
 # Set the size of EFI partition and swap partition. 
 # The unit is Byte. You can use M,G... notation.
diff --git a/script/lib/common.sh b/script/lib/common.sh
index cd0365c..43803d4 100644
--- a/script/lib/common.sh
+++ b/script/lib/common.sh
@@ -42,6 +42,34 @@ function confirmation(){
 		return 1 # with error status
 	fi # "-" is found in the volume name.
 
+	# Sanity check for lvext1 volume suffix
+	if [ "${USELVEXT1}" -ne 0 ] ; then
+		if echo "${LVEXT1SUFFIX}" | grep "-" -i > /dev/null ; then	# "-" is found in the volume name.
+			cat <<- HEREDOC 
+			***** ERROR : LVEXT1SUFFIX is "${LVEXT1SUFFIX}" *****
+			..."-" is not allowed in the volume name. 
+			...Check configuration in your config.sh
+
+			...Installation process terminated..
+			HEREDOC
+			return 1 # with error status
+		fi # "-" is found in the volume suffix.
+	fi # USELVEXT1
+
+	# Sanity check for lvext2 volume suffix
+	if [ "${USELVEXT2}" -ne 0 ] ; then
+		if echo "${LVEXT2SUFFIX}" | grep "-" -i > /dev/null ; then	# "-" is found in the volume name.
+			cat <<- HEREDOC 
+			***** ERROR : LVEXT2SUFFIX is "${LVEXT2SUFFIX}" *****
+			..."-" is not allowed in the volume name. 
+			...Check configuration in your config.sh
+
+			...Installation process terminated..
+			HEREDOC
+			return 1 # with error status
+		fi # "-" is found in the volume suffix.
+	fi # USELVEXT2
+
 	# Sanity check for swap volume name
 	if echo "${LVSWAPNAME}" | grep "-" -i > /dev/null ; then	# "-" is found in the volume name.
 		cat <<- HEREDOC 
@@ -62,6 +90,23 @@ function confirmation(){
 	Volume group name     : "${VGNAME}"
 	Root volume name      : "${VGNAME}-${LVROOTNAME}"
 	Root volume size      : "${LVROOTSIZE}"
+	HEREDOC
+
+	if [ "${USELVEXT1}" -ne 0 ] ; then
+		cat <<- HEREDOC
+		Extra volume name 1   : "${VGNAME}-${LVROOTNAME}${LVEXT1SUFFIX}"
+		Extra volume size 1   : "${LVEXT1SIZE}"
+		HEREDOC
+	fi	# USELVEXT1
+
+	if [ "${USELVEXT2}" -ne 0 ] ; then
+		cat <<- HEREDOC
+		Extra volume name 2   : "${VGNAME}-${LVROOTNAME}${LVEXT2SUFFIX}"
+		Extra volume size 2   : "${LVEXT2SIZE}"
+		HEREDOC
+	fi	# USELVEXT2
+
+	cat <<- HEREDOC
 	Swap volume name      : "${VGNAME}-${LVSWAPNAME}"
 	Swap volume size      : "${LVSWAPSIZE}"
 	--iter-time parameter : ${ITERTIME}
@@ -207,7 +252,7 @@ function pre_install() {
 			return 1 # with error status
 		fi
 	else	# not exsit
-		if [ "${OVERWRITEINSTALL}" -ne 0 ] ; then
+		if [ "${OVERWRITEINSTALL}" -ne 0 ] ; then # not exist and overwrite install
 			cat <<- HEREDOC 
 			***** ERROR : Logical volume "${VGNAME}-${LVROOTNAME}" doesn't exist while overwrite install. *****
 			...Check consistency of your config.txt.
@@ -219,6 +264,69 @@ function pre_install() {
 			echo "...Creating logical volume \"${LVROOTNAME}\" on \"${VGNAME}\"."
 			lvcreate -l "${LVROOTSIZE}" -n "${LVROOTNAME}" "${VGNAME}"
 			if [ $? -ne 0 ] ; then deactivate_and_close; return 1 ; fi;
+
+			if [ "${USELVEXT1}" -ne 0 ] ; then	# if using extra volume 1
+				if [ -e /dev/mapper/"${VGNAME}-${LVROOTNAME}${LVEXT1SUFFIX}" ] ; then # if extra volume 1 exist
+					cat <<- HEREDOC 
+					***** ERROR : Logical volume "${VGNAME}-${LVROOTNAME}${LVEXT1SUFFIX}" exists while non-overwrite install. *****
+					...Check consistency of your config.txt.
+					HEREDOC
+					# Remove newly created root volume
+					echo "...Deleting the new logical volume \"${VGNAME}-${LVROOTNAME}\"."
+					lvremove -f /dev/mapper/"${VGNAME}"-"${LVROOTNAME}" 					
+					# Deactivate all lg and close the LUKS volume
+					deactivate_and_close
+					return 1 # with error status
+				else
+					echo "...Creating logical volume \"${LVROOTNAME}${LVEXT1SUFFIX}\" on \"${VGNAME}\"."
+					lvcreate -l "${LVEXT1SIZE}" -n "${LVROOTNAME}${LVEXT1SUFFIX}" "${VGNAME}"
+					if [ $? -ne 0 ] ; then 	# if fail
+						# Remove newly created root volume
+						echo "...Deleting the new logical volume \"${VGNAME}-${LVROOTNAME}\"."
+						lvremove -f /dev/mapper/"${VGNAME}"-"${LVROOTNAME}" 					
+						# Deactivate all lg and close the LUKS volume
+						deactivate_and_close; 
+						return 1 ; 
+					fi;
+				fi
+			fi
+
+			if [ "${USELVEXT2}" -ne 0 ] ; then	# if using extra volume 2
+				if [ -e /dev/mapper/"${VGNAME}-${LVROOTNAME}${LVEXT2SUFFIX}" ] ; then # if extra volume 2 exist
+					cat <<- HEREDOC 
+					***** ERROR : Logical volume "${VGNAME}-${LVROOTNAME}${LVEXT2SUFFIX}" exists while non-overwrite install. *****
+					...Check consistency of your config.txt.
+					HEREDOC
+					# Remove newly created root volume
+					echo "...Deleting the new logical volume \"${VGNAME}-${LVROOTNAME}\"."
+					lvremove -f /dev/mapper/"${VGNAME}"-"${LVROOTNAME}" 
+					if [ "${USELVEXT1}" -ne 0 ] ; then	# if using extra volume 1
+						# Remove newly created extra volume 1
+						echo "...Deleting the new logical volume \"${VGNAME}-${LVROOTNAME}${LVEXT1SUFFIX}\"."
+						lvremove -f /dev/mapper/"${VGNAME}"-"${LVROOTNAME}${LVEXT1SUFFIX}" 					
+					fi
+					# Deactivate all lg and close the LUKS volume
+					deactivate_and_close
+					return 1 # with error status
+				else
+					echo "...Creating logical volume \"${LVROOTNAME}${LVEXT2SUFFIX}\" on \"${VGNAME}\"."
+					lvcreate -l "${LVEXT2SIZE}" -n "${LVROOTNAME}${LVEXT2SUFFIX}" "${VGNAME}"
+					if [ $? -ne 0 ] ; then 	# if fail
+						# Remove newly created root volume
+						echo "...Deleting the new logical volume \"${VGNAME}-${LVROOTNAME}\"."
+						lvremove -f /dev/mapper/"${VGNAME}"-"${LVROOTNAME}" 					
+						if [ "${USELVEXT1}" -ne 0 ] ; then	# if using extra volume 1
+							# Remove newly created extra volume 1
+							echo "...Deleting the new logical volume \"${VGNAME}-${LVROOTNAME}${LVEXT1SUFFIX}\"."
+							lvremove -f /dev/mapper/"${VGNAME}"-"${LVROOTNAME}${LVEXT1SUFFIX}" 					
+						fi
+						# Deactivate all lg and close the LUKS volume
+						deactivate_and_close; 
+						return 1 ; 
+					fi;
+				fi
+			fi
+
 		fi
 	fi
 
@@ -338,6 +446,19 @@ function on_unexpected_installer_quit(){
 	else # if not overwrite istall, delete the new volume
 		echo "...Deleting the new logical volume \"${VGNAME}-${LVROOTNAME}\"."
 		lvremove -f /dev/mapper/"${VGNAME}"-"${LVROOTNAME}" 
+
+		if [ "${USELVEXT1}" -ne 0 ] ; then	# if using extra volume 1
+			# Remove newly created extra volume 1
+			echo "...Deleting the new logical volume \"${VGNAME}-${LVROOTNAME}${LVEXT1SUFFIX}\"."
+			lvremove -f /dev/mapper/"${VGNAME}"-"${LVROOTNAME}${LVEXT1SUFFIX}" 					
+		fi
+
+		if [ "${USELVEXT2}" -ne 0 ] ; then	# if using extra volume 2
+			# Remove newly created extra volume 2
+			echo "...Deleting the new logical volume \"${VGNAME}-${LVROOTNAME}${LVEXT2SUFFIX}\"."
+			lvremove -f /dev/mapper/"${VGNAME}"-"${LVROOTNAME}${LVEXT2SUFFIX}" 					
+		fi
+
 	fi
 	# Deactivate all lg and close the LUKS volume
 	deactivate_and_close
diff --git a/script/test/config01.sh b/script/test/config01.sh
new file mode 100755
index 0000000..cfa8614
--- /dev/null
+++ b/script/test/config01.sh
@@ -0,0 +1,112 @@
+#!/bin/bash
+
+# #####################################
+
+# Test setup. 
+# /dev/sdb/
+# ERASEALL
+# LVROOT 10%
+# LVEXT1 90%
+# LVEXT2 10%
+
+# #####################################
+
+# Configuration parameters for Kaiten-Yaki 
+
+# Storage device to install the linux.  
+export DEV="/dev/sdb"
+
+# Whether you want to erase all contents of the storage device or not.
+# 1 : Yes, I want to erase all.
+# 0 : No, I don't. I want to add to the existing LUKS volume. 
+export ERASEALL=1
+
+# Logical Volume name for your Linux installation. 
+# Keep it unique from other distribution.
+export LVROOTNAME="anko"
+
+# Suffix of the optional logical volumes. 
+# If you want to have optional OVs, set USELVEXT# to 1. 
+# Then, the suffix will be added to the LVROOTNAME. 
+# For example, Assume you have setting below : 
+# LVROOTNAME="anko"
+# USELVEXT1=1
+# LVEXT1SUFFIX="_home"
+# USELVEXT2=0
+# LVEXT2SUFFIX="_var"
+# You will have
+# anko
+# anko_home
+# You will not have anko_var because the USELVEXT2=0.
+export USELVEXT1=1
+export LVEXT1SUFFIX="_home"
+export USELVEXT2=1
+export LVEXT2SUFFIX="_var"
+
+# Logical volume size of the Linux installation.
+# 30% mean, new logical volume will use 30% of the free space 
+# in the LVM volume group. For example, assume the free space is 100GB, 
+# and LVROOTSIZE is 30%FREE. Script will create 30GB logical volume.  
+# Note that the order of the volume creation is : 
+# 1. EFI if needed
+# 2. SWAP
+# 3. LVROOT
+# 4. LVEXT1 if needed
+# 5. LVEXT2 if needed
+export LVROOTSIZE="10%FREE"
+
+# Logical volume size of the optional volumes. 
+export LVEXT1SIZE="90%FREE"
+export LVEXT2SIZE="100%FREE"
+
+# Set the size of EFI partition and swap partition. 
+# The unit is Byte. You can use M,G... notation.
+export EFISIZE="200M"
+export LVSWAPSIZE="8G"
+
+# Usually, these names can be left untouched. 
+# If you change, keep them consistent through all installation in your system.
+export CRYPTPARTNAME="luks_test"
+export VGNAME="vg_test"
+export LVSWAPNAME="swap"
+
+# Do not touch this parameter, unless you understand what you are doing.
+# 1 : Overwrite the existing logical volume as root volume. 
+# 0 : Create new logical volume as root volume. 
+export OVERWRITEINSTALL=0
+
+# Do not touch this parameter, unless you understand what you are doing.
+# This is a paameter value of the --iter-time option for cyrptsetup command. 
+# If you specify 1000, that means 1000mSec. 0 means compile default.  
+export ITERTIME=0
+
+# Void Linux only. Ignored in Ubuntu.
+# The font size of the void-installer
+export XTERMFONTSIZE=11
+
+# !!!!!!!!!!!!!! DO NOT EDIT FOLLOWING LINES. !!!!!!!!!!!!!!
+
+# Detect firmware type. 1 : EFI, 0 : BIOS
+if [ -d /sys/firmware/efi ]; then
+export ISEFI=1  # Yes, EFI
+else
+export ISEFI=0  # No, BIOS
+fi # is EFI firmaare? 
+
+# Set partition number based on the firmware type
+if [  ${ISEFI} -ne 0  ] ; then 
+# EFI firmware
+export EFIPARTITION=1
+export CRYPTPARTITION=2
+else
+# BIOS firmware
+export CRYPTPARTITION=1
+fi  # EFI firmware
+
+# Detect the GUI environment
+# This code is not efered. Just left because it is interestintg code. 
+if env | grep -w -e XDG_SESSION_TYPE -e DISPLAY -e WAYLAND_DISPLAY > /dev/null ; then
+    export GUIENV=1    # set 1 if GUI env.
+else
+    export GUIENV=0    # set 0 if not GUI env.
+fi
\ No newline at end of file
diff --git a/script/test/test01.sh b/script/test/test01.sh
new file mode 100755
index 0000000..a5a2de5
--- /dev/null
+++ b/script/test/test01.sh
@@ -0,0 +1,45 @@
+#!/bin/bash -u
+
+	# shellcheck disable=SC1091
+	# Load configuration parameter
+	source ./config01.sh
+
+	# Load common functions
+	source ../lib/common.sh
+
+function main() {
+
+	# This is the mount point of the install target. 
+	export TARGETMOUNTPOINT="/target"
+
+	# ******************************************************************************* 
+	#                                Confirmation before installation 
+	# ******************************************************************************* 
+
+	# parameters for distribution check
+	export DISTRIBUTIONSIGNATURE="ubuntu"
+	export DISTRIBUTIONNAME="Ubuntu"
+
+	# Check whetehr given signature exist or not
+	if ! distribution_check ; then
+		return 1 # with error status
+	fi
+
+	# Common part of the parameter confirmation
+	if ! confirmation ; then
+		return 1 # with error status
+	fi
+
+	# ******************************************************************************* 
+	#                                Pre-install stage 
+	# ******************************************************************************* 
+
+	# Common part of the pre-install stage
+	if ! pre_install ; then
+		return 1 # with error status
+	fi
+}
+
+# main routine
+main
+
diff --git a/script/test/testutil.sh b/script/test/testutil.sh
new file mode 100644
index 0000000..a4889d2
--- /dev/null
+++ b/script/test/testutil.sh
@@ -0,0 +1,38 @@
+
+
+# ******************************************************************************* 
+#              Deactivate all LV in the VG and close LUKS volume
+# ******************************************************************************* 
+
+function util_deactivate_and_close(){
+	echo "...Deactivating all logical volumes in volume group \"${VGNAME}\"."
+	vgchange -a n "${VGNAME}"
+	echo "...Closing LUKS volume \"${CRYPTPARTNAME}\"."
+	cryptsetup close  "${CRYPTPARTNAME}"
+	cat <<- HEREDOC 
+
+	...Installation process terminated..
+	HEREDOC
+
+}
+
+# ******************************************************************************* 
+#              Delete the nwe volume if overwrite install, and close all
+# ******************************************************************************* 
+function util_cleanup(){
+    echo "...Deleting the new logical volume \"${VGNAME}-${LVROOTNAME}\"."
+    lvremove -f /dev/mapper/"${VGNAME}"-"${LVROOTNAME}" 
+
+    if [ "${USELVEXT1}" -ne 0 ] ; then	# if using extra volume 1
+        # Remove newly created extra volume 1
+        echo "...Deleting the new logical volume \"${VGNAME}-${LVROOTNAME}${LVEXT1SUFFIX}\"."
+        lvremove -f /dev/mapper/"${VGNAME}"-"${LVROOTNAME}${LVEXT1SUFFIX}" 					
+    fi
+
+    if [ "${USELVEXT2}" -ne 0 ] ; then	# if using extra volume 2
+        # Remove newly created extra volume 2
+        echo "...Deleting the new logical volume \"${VGNAME}-${LVROOTNAME}${LVEXT2SUFFIX}\"."
+        lvremove -f /dev/mapper/"${VGNAME}"-"${LVROOTNAME}${LVEXT2SUFFIX}" 					
+    fi
+
+}