diff --git a/opentelemetry-api/setup.py b/opentelemetry-api/setup.py
index d2a27a0d442..abf71aa63d5 100644
--- a/opentelemetry-api/setup.py
+++ b/opentelemetry-api/setup.py
@@ -16,15 +16,14 @@
 import setuptools
 
 BASE_DIR = os.path.dirname(__file__)
-VERSION_FILENAME = os.path.join(
-    BASE_DIR, "src", "opentelemetry", "internal", "version.py")
+VERSION_FILENAME = os.path.join(BASE_DIR, "src", "opentelemetry", "version.py")
 PACKAGE_INFO = {}
 with open(VERSION_FILENAME) as f:
-    exec(f.read(), PACKAGE_INFO) #pylint:disable=exec-used
+    exec(f.read(), PACKAGE_INFO)
 
 setuptools.setup(
     name="opentelemetry-api",
-    version=PACKAGE_INFO["__version__"],  # noqa
+    version=PACKAGE_INFO["__version__"],
     author="OpenTelemetry Authors",
     author_email="cncf-opentelemetry-contributors@lists.cncf.io",
     classifiers=[
@@ -47,7 +46,8 @@
     extras_require={},
     license="Apache-2.0",
     package_dir={"": "src"},
-    packages=setuptools.find_namespace_packages(where="src"),
+    packages=setuptools.find_namespace_packages(where="src",
+                                                include="opentelemetry.*"),
     url=("https://github.com/open-telemetry/opentelemetry-python"
          "/tree/master/opentelemetry-api"),
     zip_safe=False,
diff --git a/opentelemetry-api/src/opentelemetry/trace/__init__.py b/opentelemetry-api/src/opentelemetry/trace/__init__.py
index d5fd5446a48..b6d856bb854 100644
--- a/opentelemetry-api/src/opentelemetry/trace/__init__.py
+++ b/opentelemetry-api/src/opentelemetry/trace/__init__.py
@@ -30,8 +30,7 @@
 created as children of the currently active span, and the newly-created span
 becomes the new active span::
 
-    # TODO (#15): which module holds the global tracer?
-    from opentelemetry.api.trace import tracer
+    from opentelemetry.trace import tracer
 
     # Create a new root span, set it as the current span in context
     with tracer.start_span("parent"):
diff --git a/opentelemetry-api/src/opentelemetry/internal/version.py b/opentelemetry-api/src/opentelemetry/version.py
similarity index 100%
rename from opentelemetry-api/src/opentelemetry/internal/version.py
rename to opentelemetry-api/src/opentelemetry/version.py
diff --git a/opentelemetry-sdk/setup.py b/opentelemetry-sdk/setup.py
index b95fecb27a9..a6e62114e0d 100644
--- a/opentelemetry-sdk/setup.py
+++ b/opentelemetry-sdk/setup.py
@@ -15,15 +15,16 @@
 import os
 import setuptools
 
-base_dir = os.path.dirname(__file__)
-
-package_info = {}
-with open(os.path.join(base_dir, "src", "opentelemetry", "sdk", "version.py")) as f:
-    exec(f.read(), package_info)
+BASE_DIR = os.path.dirname(__file__)
+VERSION_FILENAME = os.path.join(BASE_DIR, "src", "opentelemetry", "sdk",
+                                "version.py")
+PACKAGE_INFO = {}
+with open(VERSION_FILENAME) as f:
+    exec(f.read(), PACKAGE_INFO)
 
 setuptools.setup(
     name="opentelemetry-sdk",
-    version=package_info["__version__"],  # noqa
+    version=PACKAGE_INFO["__version__"],
     author="OpenTelemetry Authors",
     author_email="cncf-opentelemetry-contributors@lists.cncf.io",
     classifiers=[
@@ -41,11 +42,14 @@
     include_package_data=True,
     long_description=open("README.rst").read(),
     install_requires=[
+        "opentelemetry-api==0.1.dev0"
     ],
     extras_require={},
     license="Apache-2.0",
     package_dir={"": "src"},
-    packages=setuptools.find_namespace_packages(where="src"),
-    url="https://github.com/open-telemetry/opentelemetry-python/tree/master/opentelemetry-sdk",
+    packages=setuptools.find_namespace_packages(where="src",
+                                                include="opentelemetry.sdk.*"),
+    url=("https://github.com/open-telemetry/opentelemetry-python"
+         "/tree/master/opentelemetry-sdk"),
     zip_safe=False,
 )
diff --git a/opentelemetry-sdk/src/opentelemetry/sdk/__init__.py b/opentelemetry-sdk/src/opentelemetry/sdk/__init__.py
index 2d52388da33..4978ec7226b 100644
--- a/opentelemetry-sdk/src/opentelemetry/sdk/__init__.py
+++ b/opentelemetry-sdk/src/opentelemetry/sdk/__init__.py
@@ -12,4 +12,8 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-from .version import __version__
+from . import trace
+
+__all__ = [
+    "trace",
+]
diff --git a/opentelemetry-sdk/src/opentelemetry/sdk/trace/__init__.py b/opentelemetry-sdk/src/opentelemetry/sdk/trace/__init__.py
new file mode 100644
index 00000000000..ca6f173dcb7
--- /dev/null
+++ b/opentelemetry-sdk/src/opentelemetry/sdk/trace/__init__.py
@@ -0,0 +1,19 @@
+# Copyright 2019, OpenTelemetry Authors
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+from opentelemetry import trace as trace_api
+
+
+class Tracer(trace_api.Tracer):
+    pass
diff --git a/opentelemetry-api/src/opentelemetry/__init__.py b/opentelemetry-sdk/tests/__init__.py
similarity index 100%
rename from opentelemetry-api/src/opentelemetry/__init__.py
rename to opentelemetry-sdk/tests/__init__.py
diff --git a/opentelemetry-api/src/opentelemetry/internal/__init__.py b/opentelemetry-sdk/tests/trace/__init__.py
similarity index 89%
rename from opentelemetry-api/src/opentelemetry/internal/__init__.py
rename to opentelemetry-sdk/tests/trace/__init__.py
index 83ac009440a..d853a7bcf65 100644
--- a/opentelemetry-api/src/opentelemetry/internal/__init__.py
+++ b/opentelemetry-sdk/tests/trace/__init__.py
@@ -11,9 +11,3 @@
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
-
-from .version import __version__
-
-__all__ = [
-    "__version__",
-]
diff --git a/opentelemetry-sdk/tests/trace/test_trace.py b/opentelemetry-sdk/tests/trace/test_trace.py
new file mode 100644
index 00000000000..7f6380e0ed4
--- /dev/null
+++ b/opentelemetry-sdk/tests/trace/test_trace.py
@@ -0,0 +1,25 @@
+# Copyright 2019, OpenTelemetry Authors
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import unittest
+
+from opentelemetry import trace as trace_api
+from opentelemetry.sdk import trace
+
+
+class TestTracer(unittest.TestCase):
+
+    def test_extends_api(self):
+        tracer = trace.Tracer()
+        self.assertIsInstance(tracer, trace_api.Tracer)
diff --git a/tox.ini b/tox.ini
index 085d260c260..f9761bcc01e 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,6 +1,6 @@
 [tox]
 skipsdist = True
-envlist = py{34,35,36,37}-test, lint, py37-mypy, docs
+envlist = py{34,35,36,37}-test-{api,sdk}, lint, py37-mypy, docs
 
 [travis]
 python =
@@ -11,17 +11,22 @@ deps =
   mypy: mypy~=0.711
 
 setenv =
-  PYTHONPATH={toxinidir}/opentelemetry-api/src/
-  mypy: MYPYPATH={env:PYTHONPATH}
+  mypy: MYPYPATH={toxinidir}/opentelemetry-api/src/
 
 changedir =
-  test: opentelemetry-api/tests
+  test-api: opentelemetry-api/tests
+  test-sdk: opentelemetry-sdk/tests
+
+commands_pre =
+  test-api: pip install -e {toxinidir}/opentelemetry-api
+  test-sdk: pip install -e {toxinidir}/opentelemetry-api
+  test-sdk: pip install -e {toxinidir}/opentelemetry-sdk
 
 commands =
-  py37-mypy: mypy opentelemetry-api/src/opentelemetry/
+  mypy: mypy --namespace-packages opentelemetry-api/src/opentelemetry/
 ; For test code, we don't want to enforce the full mypy strictness
-  py37-mypy: mypy --config-file=mypy-relaxed.ini opentelemetry-api/tests/ opentelemetry-api/setup.py
-  test: python -m unittest discover
+  mypy: mypy --namespace-packages --config-file=mypy-relaxed.ini opentelemetry-api/tests/
+  test-{api,sdk}: python -m unittest discover
 
 [testenv:lint]
 deps =
@@ -29,6 +34,9 @@ deps =
   flake8~=3.7
   isort~=4.3
 
+commands_pre =
+  pip install -e {toxinidir}/opentelemetry-api
+
 commands =
 ; Prefer putting everything in one pylint command to profit from duplication
 ; warnings.