diff --git a/src/composition/meson.build b/src/composition/meson.build
new file mode 100644
index 0000000..456d718
--- /dev/null
+++ b/src/composition/meson.build
@@ -0,0 +1,32 @@
+# Define the library
+composition_sources = files(
+  'private/composition.cpp',
+)
+
+composition_headers = files(
+    'public/composition.h'
+)
+
+dependencies = [
+    probe_dep,
+    config_dep,
+    quill_dep,
+]
+
+# Define the libcomposition library so it can be linked against by other parts of the build system
+libcomposition = static_library('composition',
+    composition_sources, 
+    include_directories: include_directories('public'),
+    cpp_args: ['-fvisibility=default'],
+    dependencies: dependencies,
+    install : true)
+
+composition_dep = declare_dependency(
+    include_directories: include_directories('public'),
+    link_with: libcomposition,
+    dependencies: dependencies,
+    sources: composition_sources,
+)
+
+# Make headers accessible
+install_headers(composition_headers, subdir : '4DSSE/composition')
\ No newline at end of file
diff --git a/src/composition/private/composition.h b/src/composition/private/composition.h
new file mode 100644
index 0000000..b8dc7f3
--- /dev/null
+++ b/src/composition/private/composition.h
@@ -0,0 +1,36 @@
+#ifndef COMPOSITION_H
+#define COMPOSITION_H
+
+#include <iomanip>
+#include <iostream>
+#include <string>
+#include <unordered_map>
+#include <vector>
+
+#include "quill/LogMacros.h
+
+#include "probe.h"
+#include "config.h"
+
+struct CompositionEntry {
+    std::string symbol;
+    std::string mass_fraction;
+
+    friend std::ostream& operator<<(std::ostream& os, const CompositionEntry& entry) {
+        os << std::setw(5) << "<" << entry.symbol << " : " << entry.mass_fraction << ">";
+        return os;
+    }
+};
+
+class Composition {
+private:
+    Config& m_config = Config::getInstance();
+    Probe::LogManager& m_logManager = Probe::LogManager::getInstance();
+    quill::Logger* m_logger = logManager.getLogger('log');
+
+    std::vector<std::string> m_registeredSymbols;
+    std::unordered_map<std::string, CompositionEntry> m_compositions;
+
+}
+
+#endif // COMPOSITION_H
\ No newline at end of file
diff --git a/tests/composition/compositionTest.cpp b/tests/composition/compositionTest.cpp
new file mode 100644
index 0000000..1336983
--- /dev/null
+++ b/tests/composition/compositionTest.cpp
@@ -0,0 +1,21 @@
+#include <gtest/gtest.h>
+#include <string>
+#include <algorithm>
+
+#include "atomicSpecies.h"
+
+std::string EXAMPLE_FILENAME = std::string(getenv("MESON_SOURCE_ROOT")) + "/tests/composition/example.yaml";
+
+/**
+ * @brief Test suite for the composition class.
+ */
+class compositionTest : public ::testing::Test {};
+
+/**
+ * @brief Test the constructor of the composition class.
+ */
+TEST_F(compositionTest, constructor) {
+    std::cout << "Testing the constructor of the composition class." << std::endl;
+    std::cout << chemSpecies::species.at("H-1") << std::endl;
+}
+
diff --git a/tests/composition/meson.build b/tests/composition/meson.build
new file mode 100644
index 0000000..a5b6889
--- /dev/null
+++ b/tests/composition/meson.build
@@ -0,0 +1,23 @@
+# Test files for const
+test_sources = [
+    'compositionTest.cpp',
+]
+
+foreach test_file : test_sources
+  exe_name = test_file.split('.')[0]
+  message('Building test: ' + exe_name)
+
+  # Create an executable target for each test
+  test_exe = executable(
+      exe_name,
+      test_file,
+      dependencies: [gtest_dep, species_weight_dep, gtest_main],
+      install_rpath: '@loader_path/../../src'  # Ensure runtime library path resolves correctly
+  )
+
+  # Add the executable as a test
+  test(
+    exe_name,
+    test_exe,
+    env: ['MESON_SOURCE_ROOT=' + meson.project_source_root(), 'MESON_BUILD_ROOT=' + meson.project_build_root()])
+endforeach