diff --git a/CMakeLists.txt b/CMakeLists.txt
new file mode 100644
index 0000000..ef192b0
--- /dev/null
+++ b/CMakeLists.txt
@@ -0,0 +1,35 @@
+cmake_minimum_required(VERSION 3.16)
+project(cmake-exercise)
+
+set(CMAKE_CXX_STANDARD 17)
+
+# Find Boost package for flatset and filesystem
+find_package(Boost REQUIRED COMPONENTS filesystem)
+
+# Find deal for fem
+find_package(deal.II REQUIRED)
+deal_ii_initialize_cached_variables()
+
+# Find yaml
+find_package(yaml-cpp REQUIRED)
+
+# Source files
+add_executable(main 
+    main.cpp
+    flatset/flatset.cpp 
+    filesystem/filesystem.cpp
+    fem/fem.cpp
+    yamlParser/yamlParser.cpp
+)
+
+# Include directories so that main can find header files
+target_include_directories(main PUBLIC ${CMAKE_SOURCE_DIR})
+
+# Needed to link boost filesystem
+target_link_libraries(main Boost::filesystem)
+
+# Needed to link yaml
+target_link_libraries(main yaml-cpp)
+
+# macro: https://dealii.org/current/users/cmake_user.html#cmakeauto
+deal_ii_setup_target(main)
\ No newline at end of file
diff --git a/Dockerfile b/Dockerfile
new file mode 100644
index 0000000..5bd3186
--- /dev/null
+++ b/Dockerfile
@@ -0,0 +1,30 @@
+FROM ubuntu:24.04
+
+RUN apt-get update && \
+    apt-get install -y \
+    build-essential \ 
+    cmake \
+    libboost-all-dev \
+    libdeal.ii-dev \
+    wget \
+    unzip \
+    && rm -rf /var/lib/apt/lists/*
+
+# Download yaml 0.6.3
+WORKDIR /tmp
+RUN wget https://github.com/jbeder/yaml-cpp/archive/refs/tags/yaml-cpp-0.6.3.zip
+RUN unzip yaml-cpp-0.6.3.zip
+
+# Building yaml
+WORKDIR /tmp/yaml-cpp-yaml-cpp-0.6.3/build
+RUN cmake .. -DYNAML_BUILD_SHARED_LIBS=ON && \
+    make && \
+    make install
+
+# Cleanup
+WORKDIR /
+RUN rm -rf /tmp/yaml-cpp*
+
+ENV LD_LIBRARY_PATH=/usr/local/lib:$LD_LIBRARY_PATH
+
+WORKDIR /cmake-exercise
\ No newline at end of file
diff --git a/README.md b/README.md
index 9e27f1f..3df5747 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,13 @@
 # Let's Fight With CMake, Docker, and Some Dependencies
 
 Repository for the [CMake exercise](https://github.com/Simulation-Software-Engineering/Lecture-Material/blob/main/03_building_and_packaging/cmake_exercise.md).
+
+# Build and Running
+docker build -t cmake-exercise .
+docker run -it --rm -v <directory>:/cmake-exercise cmake-exercise
+//Statt dem directory auch ${PWD}
+
+mkdir build
+cmake ..
+make
+./main
diff --git a/main.cpp b/main.cpp
index 7588360..08bc4a9 100644
--- a/main.cpp
+++ b/main.cpp
@@ -1,39 +1,39 @@
-//#include "fem/fem.hpp"
-//#include "flatset/flatset.hpp"
-//#include "filesystem/filesystem.hpp"
-//#include "yamlParser/yamlParser.hpp"
+#include "fem/fem.hpp"
+#include "flatset/flatset.hpp"
+#include "filesystem/filesystem.hpp"
+#include "yamlParser/yamlParser.hpp"
 #include <iostream>
 
 int main(int argc, char *argv[])
 {
   std::cout << "Let's fight with CMake, Docker, and some dependencies!" << std::endl << std::endl;
 
-  //std::cout << "Solve Poisson problem with FEM using deal.II" << std::endl;
-  //Fem fem;
-  //fem.run();
-  //std::cout << std::endl;
+  std::cout << "Solve Poisson problem with FEM using deal.II" << std::endl;
+  Fem fem;
+  fem.run();
+  std::cout << std::endl;
 
-  //std::cout << "Modify a flat set using boost container" << std::endl;
-  //modifyAndPrintSets();
-  //std::cout << std::endl;
+  std::cout << "Modify a flat set using boost container" << std::endl;
+  modifyAndPrintSets();
+  std::cout << std::endl;
 
-  //std::cout << "Inspect the current directory using boost filesystem" << std::endl;
-  //inspectDirectory();
-  //std::cout << std::endl;
+  std::cout << "Inspect the current directory using boost filesystem" << std::endl;
+  inspectDirectory();
+  std::cout << std::endl;
 
   
-  //if ( argc == 2 )
-  //{
-  //  const std::string yamlFile( argv[1] );
-  //  std::cout << "Parse some yaml file with yaml-cpp" << std::endl;
-  //  std::cout << "  " << yamlFile << std::endl;
-  //  parseConfig( yamlFile );
-  //}
-  //else
-  //{
-  //  std::cout << "To parse a yaml file please specify file on command line" << std::endl;
-  //  std::cout << "  ./main YAMLFILE" << std::endl;
-  //}
+  if ( argc == 2 )
+  {
+    const std::string yamlFile( argv[1] );
+    std::cout << "Parse some yaml file with yaml-cpp" << std::endl;
+    std::cout << "  " << yamlFile << std::endl;
+    parseConfig( yamlFile );
+  }
+  else
+  {
+    std::cout << "To parse a yaml file please specify file on command line" << std::endl;
+    std::cout << "  ./main YAMLFILE" << std::endl;
+  }
 
   return 0;
 }