diff --git a/proto/V2SvkModel.proto b/proto/V2SvkModel.proto
index 9f63d8c..8a8c268 100644
--- a/proto/V2SvkModel.proto
+++ b/proto/V2SvkModel.proto
@@ -4,5 +4,48 @@ package ESGRAF48;
 
 message V2SvkModel
 {
-	string dummy = 1;
+	message OneEach
+	{
+		bool Affe = 1;
+		bool Schwein = 2;
+		bool Gans = 3;
+	}
+
+	message TwoEach
+	{
+		bool Affe1 = 1;
+		bool Affe2 = 2;
+		bool Schwein1 = 3;
+		bool Schwein2 = 4;
+		bool Gans1 = 5;
+		bool Gans2 = 6;
+	}
+
+	message FourEach
+	{
+		bool Affe1 = 1;
+		bool Affe2 = 2;
+		bool Affe3 = 3;
+		bool Affe4 = 4;
+		bool Schwein1 = 5;
+		bool Schwein2 = 6;
+		bool Schwein3 = 7;
+		bool Schwein4 = 8;
+		bool Gans1 = 9;
+		bool Gans2 = 10;
+		bool Gans3 = 11;
+		bool Gans4 = 12;
+	}
+
+	FourEach WFrage = 1;
+	OneEach Verbtrennung1 = 2;
+	FourEach SvkSt = 3;
+	FourEach ObjTop = 4;
+	FourEach SvkStamm = 5;
+	TwoEach TempPraes = 6;
+	TwoEach SvkE1 = 7;
+	TwoEach TempPerf = 8;
+	TwoEach Verbtrennung2 = 9;
+	TwoEach SvkE2 = 10;
+	TwoEach Partizip = 11;
 }
diff --git a/source/CMakeLists.txt b/source/CMakeLists.txt
index 5bdd8f2..410e0fe 100644
--- a/source/CMakeLists.txt
+++ b/source/CMakeLists.txt
@@ -23,7 +23,7 @@ set(DataModel_PROTO_FILES
 	../proto/V2SvkModel.proto
 )
 
-protobuf_generate_cpp(PROTO_SRCS PROTO_HDRS
+protobuf_generate_cpp(DataModel_PROTO_SRCS DataModel_PROTO_HDRS
 	${DataModel_PROTO_FILES})
 
 add_executable(${PROJECT_NAME} WIN32
@@ -33,8 +33,8 @@ add_executable(${PROJECT_NAME} WIN32
 	Age.cpp
 	${LOGO_TEST_UI}
 	${LOGO_TEST_QRC}
-	${PROTO_SRCS}
-	${PROTO_HDRS}
+	${DataModel_PROTO_SRCS}
+	${DataModel_PROTO_HDRS}
 )
 
 set_target_properties(${PROJECT_NAME}
diff --git a/source/DataModel.cpp b/source/DataModel.cpp
index f5fc181..2f571c1 100644
--- a/source/DataModel.cpp
+++ b/source/DataModel.cpp
@@ -1,7 +1,10 @@
 #include "DataModel.h"
 
+#include "DataModel.pb.h"
 #include <QDebug>
 
+#include <google/protobuf/text_format.h>
+
 #include <sstream>
 
 DataModel::DataModel(QObject *parent)
@@ -54,6 +57,26 @@ void DataModel::read(const QJsonObject &source)
 	read(m_genitiv, source, "Genitiv");
 }
 
+void DataModel::writeProtoBuf(std::ostream &outStream) const
+{
+	ESGRAF48::DataModel dataModel;
+	//m_metaData.writeProtoBuf(dataModel.mutable_metadata);
+	m_v2Svk.writeProtoBuf(*dataModel.mutable_v2svk());
+	dataModel.SerializeToOstream(&outStream);
+
+	std::string saveData;
+	google::protobuf::TextFormat::PrintToString(dataModel, &saveData);
+	qDebug() << "Wrote:" << QString::fromStdString(saveData);
+}
+
+void DataModel::readProtoBuf(std::istream &inStream)
+{
+	ESGRAF48::DataModel dataModel;
+	dataModel.ParseFromIstream(&inStream);
+
+	m_v2Svk.readProtoBuf(dataModel.v2svk());
+}
+
 std::string DataModel::toHtml() const
 {
 	std::stringstream out;
diff --git a/source/DataModel.h b/source/DataModel.h
index b2d6f13..2ac876d 100644
--- a/source/DataModel.h
+++ b/source/DataModel.h
@@ -39,6 +39,9 @@ public:
 
 	std::string toHtml() const;
 
+	void writeProtoBuf(std::ostream &outStream) const;
+	void readProtoBuf(std::istream &inStream);
+
 signals:
 	void modelChanged();
 
diff --git a/source/MetaData/CMakeLists.txt b/source/MetaData/CMakeLists.txt
index 01aa53f..d8a6379 100644
--- a/source/MetaData/CMakeLists.txt
+++ b/source/MetaData/CMakeLists.txt
@@ -3,6 +3,7 @@ cmake_minimum_required(VERSION 3.6)
 project(MetaData LANGUAGES CXX)
 
 find_package(Qt5Widgets REQUIRED)
+find_package(Protobuf REQUIRED)
 
 set(CMAKE_AUTOMOC ON)
 
@@ -10,10 +11,20 @@ qt5_wrap_ui(META_DATA_UI
 	MetaDataWidget.ui
 )
 
+set(MetaDataModel_PROTO_FILES
+	../../proto/MetaDataModel.proto
+)
+
+protobuf_generate_cpp(MetaDataModel_PROTO_SRCS MetaDataModel_PROTO_HDRS
+	${MetaDataModel_PROTO_FILES}
+)
+
 add_library(${PROJECT_NAME}
 	MetaDataModel.cpp
 	MetaDataWidget.cpp
 	${META_DATA_UI}
+	${MetaDateModel_PROTO_SRCS}
+	${MetaDateModel_PROTO_HDRS}
 )
 
 set_target_properties(${PROJECT_NAME}
@@ -23,6 +34,7 @@ set_target_properties(${PROJECT_NAME}
 target_include_directories(${PROJECT_NAME}
 	PRIVATE
 		${CMAKE_CURRENT_BINARY_DIR}
+		${Protobuf_INCLUDE_DIRS}
 	INTERFACE
 		${CMAKE_CURRENT_SOURCE_DIR}
 )
@@ -30,4 +42,5 @@ target_include_directories(${PROJECT_NAME}
 target_link_libraries(${PROJECT_NAME}
 	PRIVATE
 		Qt5::Widgets
+		${Protobuf_LIBRARIES}
 )
diff --git a/source/MetaData/MetaDataModel.cpp b/source/MetaData/MetaDataModel.cpp
index 7219715..1877777 100644
--- a/source/MetaData/MetaDataModel.cpp
+++ b/source/MetaData/MetaDataModel.cpp
@@ -130,6 +130,10 @@ void MetaDataModel::read(const QJsonObject &json)
 	setData(index(0, 4), json["remarks"].toVariant(), Qt::EditRole);
 }
 
+//void MetaDataModel::writeProtoBuf(ESGRAF48::MetaDataModel &model) const
+//{
+//}
+
 std::string MetaDataModel::toHtml() const
 {
 	std::ostringstream out;
diff --git a/source/MetaData/MetaDataModel.h b/source/MetaData/MetaDataModel.h
index 6c81f8a..1de7a0f 100644
--- a/source/MetaData/MetaDataModel.h
+++ b/source/MetaData/MetaDataModel.h
@@ -2,6 +2,8 @@
 
 #include "../Age.h"
 
+//#include "MetaDataModel.pb.h"
+
 #include <QAbstractTableModel>
 #include <QString>
 #include <QDate>
@@ -31,6 +33,8 @@ public:
 	void write(QJsonObject &json) const;
 	void read(const QJsonObject &json);
 
+	//void writeProtoBuf(ESGRAF48::MetaDataModel &model) const;
+
 	std::string toHtml() const;
 
 	Age getAge() const
diff --git a/source/SubTests/V2Svk/CMakeLists.txt b/source/SubTests/V2Svk/CMakeLists.txt
index fdd3fe6..caf6c8c 100644
--- a/source/SubTests/V2Svk/CMakeLists.txt
+++ b/source/SubTests/V2Svk/CMakeLists.txt
@@ -15,14 +15,14 @@ set(V2Svk_PROTO_FILES
 	../../../proto/V2SvkModel.proto
 )
 
-protobuf_generate_cpp(PROTO_SRCS PROTO_HDRS ${V2Svk_PROTO_FILES})
+protobuf_generate_cpp(V2Svk_PROTO_SRCS V2Svk_PROTO_HDRS ${V2Svk_PROTO_FILES})
 
 add_library(${PROJECT_NAME}
 	V2SvkWidget.cpp
 	V2SvkModel.cpp
 	${UI_HEADERS}
-	${PROTO_SRCS}
-	${PROTO_HDRS}
+	${V2Svk_PROTO_SRCS}
+	${V2Svk_PROTO_HDRS}
 )
 
 set_target_properties(${PROJECT_NAME}
diff --git a/source/SubTests/V2Svk/V2SvkModel.cpp b/source/SubTests/V2Svk/V2SvkModel.cpp
index 249fe91..b86cef9 100644
--- a/source/SubTests/V2Svk/V2SvkModel.cpp
+++ b/source/SubTests/V2Svk/V2SvkModel.cpp
@@ -75,3 +75,67 @@ unsigned int V2SvkModel::getSvkPoints()
 
 	return points;
 }
+
+void V2SvkModel::writeProtoBuf(ESGRAF48::V2SvkModel &model) const
+{
+	auto *wfrage = model.mutable_wfrage();
+	if (wfrage != nullptr)
+	{
+		const auto &items = m_tests.at(0).items();
+
+		wfrage->set_affe1(items[0].isChecked());
+		wfrage->set_affe2(items[1].isChecked());
+		wfrage->set_affe3(items[2].isChecked());
+		wfrage->set_affe4(items[3].isChecked());
+		wfrage->set_schwein1(items[4].isChecked());
+		wfrage->set_schwein2(items[5].isChecked());
+		wfrage->set_schwein3(items[6].isChecked());
+		wfrage->set_schwein4(items[7].isChecked());
+		wfrage->set_gans1(items[8].isChecked());
+		wfrage->set_gans2(items[9].isChecked());
+		wfrage->set_gans3(items[10].isChecked());
+		wfrage->set_gans4(items[11].isChecked());
+	}
+
+	auto *verbtrennung = model.mutable_verbtrennung1();
+	if (verbtrennung != nullptr)
+	{
+		const auto &testItems = m_tests.at(1).items();
+
+		verbtrennung->set_affe(testItems[1].isChecked());
+		verbtrennung->set_schwein(testItems[7].isChecked());
+		verbtrennung->set_gans(testItems[10].isChecked());
+	}
+}
+	
+void V2SvkModel::readProtoBuf(const ESGRAF48::V2SvkModel &model)
+{
+	const auto &wfrage = model.wfrage();
+	{
+		auto &testItems = m_tests.at(0).items();
+
+		testItems[0].setState(wfrage.affe1());
+		testItems[1].setState(wfrage.affe2());
+		testItems[2].setState(wfrage.affe3());
+		testItems[3].setState(wfrage.affe4());
+		testItems[4].setState(wfrage.schwein1());
+		testItems[5].setState(wfrage.schwein2());
+		testItems[6].setState(wfrage.schwein3());
+		testItems[7].setState(wfrage.schwein4());
+		testItems[8].setState(wfrage.gans1());
+		testItems[9].setState(wfrage.gans2());
+		testItems[10].setState(wfrage.gans3());
+		testItems[11].setState(wfrage.gans4());
+	}
+
+	const auto &verbtrennung = model.verbtrennung1();
+	{
+		auto &testItems = m_tests.at(1).items();
+
+		testItems[1].setState(verbtrennung.affe());
+		testItems[7].setState(verbtrennung.schwein());
+		testItems[10].setState(verbtrennung.gans());
+	}
+
+	emit dataChanged(index(0, 0), index(rowCount() - 1, columnCount() - 1));
+}
diff --git a/source/SubTests/V2Svk/V2SvkModel.h b/source/SubTests/V2Svk/V2SvkModel.h
index 456c572..091e5b6 100644
--- a/source/SubTests/V2Svk/V2SvkModel.h
+++ b/source/SubTests/V2Svk/V2SvkModel.h
@@ -1,6 +1,7 @@
 #pragma once
 
 #include "CheckableTestModel.h"
+#include "V2SvkModel.pb.h"
 
 class V2SvkModel : public CheckableTestModel
 {
@@ -11,4 +12,7 @@ public:
 
 	unsigned int getV2Points();
 	unsigned int getSvkPoints();
+
+	void writeProtoBuf(ESGRAF48::V2SvkModel &model) const;
+	void readProtoBuf(const ESGRAF48::V2SvkModel &model);
 };
diff --git a/source/mainwindow.cpp b/source/mainwindow.cpp
index 12bc99f..18642ab 100644
--- a/source/mainwindow.cpp
+++ b/source/mainwindow.cpp
@@ -74,17 +74,25 @@ void MainWindow::openFile()
 
 	closeFile();
 
-	QFile loadFile(filename);
-	if (!loadFile.open(QFile::ReadOnly))
+	if (true)
 	{
-		qWarning("Could not open file");
-		return;
+		std::fstream protoInFile(filename.toStdString(), std::ios::in | std::ios::binary);
+		m_dataModel->readProtoBuf(protoInFile);
 	}
+	else
+	{
+		QFile loadFile(filename);
+		if (!loadFile.open(QFile::ReadOnly))
+		{
+			qWarning("Could not open file");
+			return;
+		}
 
-	QByteArray byteData = loadFile.readAll();
-	QJsonDocument loadDoc = QJsonDocument::fromJson(byteData);
+		QByteArray byteData = loadFile.readAll();
+		QJsonDocument loadDoc = QJsonDocument::fromJson(byteData);
 
-	m_dataModel->read(loadDoc.object());
+		m_dataModel->read(loadDoc.object());
+	}
 
 	setWindowModified(false);
 	setWindowTitle(filename + "[*]");
@@ -167,16 +175,24 @@ void MainWindow::closeEvent(QCloseEvent *event)
 
 void MainWindow::saveFile(const QString &filename)
 {
-	QJsonObject saveData;
-	m_dataModel->write(saveData);
+	if (true)
+	{
+		std::fstream protoOutFile(filename.toStdString(),
+		                          std::ios::out | std::ios::trunc | std::ios::binary);
+		m_dataModel->writeProtoBuf(protoOutFile);
+	}
+	else
+	{
+		QJsonObject saveData;
+		m_dataModel->write(saveData);
 
-	QJsonDocument saveDoc(saveData);
-
-	QFile saveFile(filename);
-	saveFile.open(QFile::WriteOnly);
-	saveFile.write(saveDoc.toJson());
-	saveFile.close();
+		QJsonDocument saveDoc(saveData);
 
+		QFile saveFile(filename);
+		saveFile.open(QFile::WriteOnly);
+		saveFile.write(saveDoc.toJson());
+		saveFile.close();
+	}
 	qDebug() << "Wrote" << filename;
 
 	setWindowTitle(filename + "[*]");