diff --git a/.gitignore b/.gitignore
index 4f0aa02..bd3a7de 100644
--- a/.gitignore
+++ b/.gitignore
@@ -63,3 +63,10 @@ target/
 
 # Scons
 .sconsign.dblite
+
+# doit
+.doit.db
+.doit.db.db
+
+# vim
+*.swp
diff --git a/.travis.yml b/.travis.yml
index ab74573..f5ff061 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -7,5 +7,6 @@ before_install:
 install:
   - pip install -U pip setuptools
   - PIP_FIND_LINKS=~/travis-wheels/wheelhouse pip install -r dev-requirements.txt -e .
+  - pip install scons doit
 script:
   - py.test -v -x
diff --git a/nbflow/doit.py b/nbflow/doit.py
new file mode 100644
index 0000000..3174d10
--- /dev/null
+++ b/nbflow/doit.py
@@ -0,0 +1,58 @@
+from __future__ import print_function
+
+import json
+import subprocess as sp
+import sys
+
+from .extractor import DependencyExtractor
+from ._version import __version__
+
+
+def build_notebook_cmd(notebook):
+    cmd = [
+        "jupyter", "nbconvert",
+        "--log-level=ERROR",
+        "--ExecutePreprocessor.timeout=120",
+        "--execute",
+        "--inplace",
+        "--to", "notebook",
+        #"--output", notebook,
+        notebook
+    ]
+    return ' '.join(cmd)
+
+
+def touch_cmds(target):
+    for t in target:
+        yield 'touch {0}'.format(str(t))
+
+
+def get_cmds(notebook, target):
+    yield build_notebook_cmd(notebook)
+    for cmd in touch_cmds(target):
+        yield cmd
+
+
+def setup(directories):
+    parsed = sp.check_output([sys.executable, "-m", "nbflow"] + directories,
+                 universal_newlines=True)
+    DEPENDENCIES = json.loads(parsed)
+    for script in DEPENDENCIES:
+        deps = DEPENDENCIES[script]
+        sources = deps['sources']
+        if len(deps['targets']) == 0:
+            #targets = ['.phony_{}'.format(script)]
+            targets = []
+        else:
+            targets = deps['targets']
+        
+        name = 'build-notebook:{0}'.format(script)
+        file_dep = [script] + sources
+        actions = list(get_cmds(script, targets))
+        
+        yield {'name': name,
+               'actions': actions,
+               'targets': targets,
+               'file_dep': file_dep,
+               'clean': True}
+
diff --git a/nbflow/example/dodo.py b/nbflow/example/dodo.py
new file mode 100644
index 0000000..723c319
--- /dev/null
+++ b/nbflow/example/dodo.py
@@ -0,0 +1,6 @@
+import os
+from nbflow import doit
+
+def task_nbflow():
+    for task in doit.setup(['analyses']):
+        yield task
diff --git a/nbflow/extractor.py b/nbflow/extractor.py
index 6341382..b928f17 100644
--- a/nbflow/extractor.py
+++ b/nbflow/extractor.py
@@ -1,3 +1,5 @@
+from __future__ import print_function
+
 import os
 import glob
 import json
@@ -57,11 +59,10 @@ def get_dependencies(self, dirnames):
                 sources = [self.resolve_path(filename, x) for x in params['__depends__']]
 
                 targets = params['__dest__']
-                if not hasattr(targets, '__iter__'):
-                    if targets is None:
-                        targets = []
-                    else:
-                        targets = [targets]
+                if targets is None:
+                    targets = []
+                elif isinstance(targets, str):
+                    targets = [targets]
                 targets = [self.resolve_path(filename, x) for x in targets]
 
                 dependencies[os.path.join(dirname, '{}.ipynb'.format(modname))] = {
diff --git a/nbflow/tests/test_nbflow.py b/nbflow/tests/test_nbflow.py
index 4a48f3f..a09087c 100644
--- a/nbflow/tests/test_nbflow.py
+++ b/nbflow/tests/test_nbflow.py
@@ -12,7 +12,7 @@ def test_nbflow_no_args(temp_cwd):
 
 def test_example(temp_cwd):
     # copy example files
-    root = os.path.abspath(os.path.join(os.path.dirname(__file__), "..", "example"))
+    root = os.path.abspath(os.path.join(os.path.dirname(__file__), "..", "scons-example"))
     shutil.copytree(os.path.join(root, "analyses"), "analyses")
     shutil.copy(os.path.join(root, "SConstruct"), "SConstruct")
     clear_notebooks("analyses")
diff --git a/requirements.txt b/requirements.txt
index ee81e4d..e711ee4 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,3 @@
 traitlets
 nbconvert==4.1
-scons
-ipykernel
\ No newline at end of file
+ipykernel