diff --git a/src/pyokit/datastruct/genomicInterval.py b/src/pyokit/datastruct/genomicInterval.py
index d7b478c..95793fe 100755
--- a/src/pyokit/datastruct/genomicInterval.py
+++ b/src/pyokit/datastruct/genomicInterval.py
@@ -54,6 +54,36 @@ class InvalidStartIndexError(GenomicIntervalError):
 #        FUNCTIONS FOR MANIPULATING COLLECTIONS OF GENOMIC INTERVALS          #
 ###############################################################################
 
+def jaccardIndex(s1, s2, stranded=False):
+  """
+  Compute the Jaccard index for two collections of genomic intervals
+
+  :param s1: the first set of genomic intervals
+  :param s2: the second set of genomic intervals
+  :param stranded: if True, treat regions on different strands as not
+                   intersecting each other, even if they occupy the same
+                   genomic region.
+  :return: Jaccard index
+  """
+
+  def count(s):
+    """ sum the size of regions in s. """
+    tot = 0
+    for r in s:
+      tot += len(r)
+    return tot
+
+  if stranded:
+    raise GenomicIntervalError("Sorry, stranded mode for computing Jaccard " +
+                               "index hasn't been implemented yet.")
+
+  s1 = collapseRegions(s1)
+  s2 = collapseRegions(s2)
+  intersection = regionsIntersection(s1, s2)
+  c_i = count(intersection)
+  return c_i / float(count(s1) + count(s2) - c_i)
+
+
 def intervalTreesFromList(inElements, verbose=False, openEnded=False):
   """
   build a dictionary, indexed by chrom name, of interval trees for each chrom.
@@ -197,7 +227,7 @@ def get_first_matching_index(s, proc_strands):
   return res
 
 
-def regionsIntersection(s1, s2):
+def regionsIntersection(s1, s2, collapse=True):
   """
   given two lists of genomic regions with chromosome, start and end
   coordinates, return a new list of regions which is the intersection of those
diff --git a/src/pyokit/scripts/genomicIntJaccard.py b/src/pyokit/scripts/genomicIntJaccard.py
new file mode 100644
index 0000000..556e723
--- /dev/null
+++ b/src/pyokit/scripts/genomicIntJaccard.py
@@ -0,0 +1,147 @@
+#!/usr/bin/python
+
+"""
+  Date of Creation: Dec 2015
+  Description:      Compute the Jaccard index for regions in two files
+
+  Copyright (C) 2010-2014
+  Philip J. Uren
+
+  Authors: Philip J. Uren
+
+  This program is free software: you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation, either version 3 of the License, or
+  (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+"""
+
+# python imports
+import os
+import sys
+import unittest
+import StringIO
+
+# for unit testing
+import mock
+
+# pyokit imports
+from pyokit.interface.cli import CLI, Option
+from pyokit.io.bedIterators import BEDIterator
+from pyokit.datastruct.genomicInterval import jaccardIndex
+from pyokit.util.testing import build_mock_open_side_effect
+
+
+###############################################################################
+#                              USER INTERFACE                                 #
+###############################################################################
+
+def getUI(args):
+  """
+  build and return a UI object for this script.
+
+  :param args: raw arguments to parse
+  """
+  programName = os.path.basename(sys.argv[0])
+  longDescription = "Compute the Jaccard index for two sets of genomic " +\
+                    "intervals."
+  shortDescription = longDescription
+
+  ui = CLI(programName, shortDescription, longDescription)
+  ui.minArgs = 2
+  ui.maxArgs = 2
+  ui.addOption(Option(short="v", long="verbose",
+                      description="output additional messages to stderr " +
+                                  "about run", required=False))
+  ui.addOption(Option(short="s", long="stranded",
+                      description="treat regions on separate strands as " +
+                                  "disjoint, even if they overlap",
+                                  required=False))
+  ui.addOption(Option(short="h", long="help",
+                      description="show this help message ", special=True))
+  ui.addOption(Option(short="u", long="test",
+                      description="run unit tests ", special=True))
+
+  ui.parseCommandLine(args)
+  return ui
+
+
+################################################################################
+#                     COMMAND LINE PROCESSING AND DISPATCH                     #
+################################################################################
+
+def main(args):
+  """
+  main entry point for the GenomicIntJaccard script.
+
+  :param args: the arguments for this script, as a list of string. Should
+               already have had things like the script name stripped. That
+               is, if there are no args provided, this should be an empty
+               list.
+  """
+  # get options and arguments
+  ui = getUI(args)
+
+  if ui.optionIsSet("test"):
+    # just run unit tests
+    unittest.main(argv=[sys.argv[0]])
+  elif ui.optionIsSet("help"):
+    # just show help
+    ui.usage()
+  else:
+    verbose = ui.optionIsSet("verbose")
+    stranded = ui.optionIsSet("stranded")
+
+    if stranded:
+      sys.stderr.write("Sorry, stranded mode hasn't been implemented yet.")
+      sys.exit()
+
+    # we required two input files, so we know these will be present...
+    regions_1 = [e for e in BEDIterator(ui.getArgument(0), verbose=verbose)]
+    regions_2 = [e for e in BEDIterator(ui.getArgument(1), verbose=verbose)]
+
+    print jaccardIndex(regions_1, regions_2)
+
+
+###############################################################################
+#                         UNIT TESTS FOR THIS MODULE                          #
+###############################################################################
+
+class TestGenomicIntJaccard(unittest.TestCase):
+
+  def setUp(self):
+    f1_conts = "\n".join(["\t".join(["chr1", "10", "20", "F1_R1", "0", "+"]),
+                          "\t".join(["chr1", "70", "80", "F2_R2", "0", "+"]),
+                          "\t".join(["chr2", "05", "10", "F2_R2", "0", "+"]),
+                          "\t".join(["chr2", "70", "75", "F2_R2", "0", "+"]),
+                          "\t".join(["chr2", "90", "95", "F2_R2", "0", "+"])])
+    f2_conts = "\n".join(["\t".join(["chr1", "07", "12", "F1_R1", "0", "+"]),
+                          "\t".join(["chr1", "67", "70", "F2_R2", "0", "+"]),
+                          "\t".join(["chr1", "75", "85", "F2_R2", "0", "+"]),
+                          "\t".join(["chr2", "20", "30", "F2_R2", "0", "+"]),
+                          "\t".join(["chr2", "73", "92", "F2_R2", "0", "+"])])
+    string_d = {"file1.bed": f1_conts,
+                "file2.bed": f2_conts}
+    self.mock_open_side_effect = build_mock_open_side_effect(string_d, {})
+
+  @mock.patch('__builtin__.open')
+  @mock.patch('sys.stdout', new_callable=StringIO.StringIO)
+  def test_simple(self, mock_stdout, mock_open):
+    mock_open.side_effect = self.mock_open_side_effect
+    main(["file1.bed", "file2.bed"])
+    self.assertAlmostEqual(float(mock_stdout.getvalue()), 0.1549296)
+
+
+###############################################################################
+#               ENTRY POINT WHEN RUN AS A STAND-ALONE MODULE                  #
+###############################################################################
+
+if __name__ == "__main__":
+    unittest.main(argv=[sys.argv[0]])
diff --git a/src/pyokit/scripts/genomicIntersection.py b/src/pyokit/scripts/genomicIntersection.py
new file mode 100644
index 0000000..c0609b0
--- /dev/null
+++ b/src/pyokit/scripts/genomicIntersection.py
@@ -0,0 +1,165 @@
+#!/usr/bin/python
+
+"""
+  Date of Creation: Dec 2015
+  Description:      Get the intersection of genomic regions in one or more
+                    files
+
+  Copyright (C) 2010-2015
+  Philip J. Uren
+
+  Authors: Philip J. Uren
+
+  This program is free software: you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation, either version 3 of the License, or
+  (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+"""
+
+# standard python imports
+import os
+import sys
+import unittest
+import StringIO
+
+# for unit testing
+import mock
+
+# pyokit imports
+from pyokit.interface.cli import CLI, Option
+from pyokit.io.bedIterators import BEDIterator
+from pyokit.util.testing import build_mock_open_side_effect
+from pyokit.datastruct.genomicInterval import regionsIntersection
+
+
+################################################################################
+#                               USER INTERFACE                                 #
+################################################################################
+
+def getUI(args):
+  """
+  build and return a UI object for this script.
+
+  :param args: raw arguments to parse
+  """
+  programName = os.path.basename(sys.argv[0])
+  longDescription = "takes a file with a list of p-values and applies " +\
+                    "Benjamini and Hochberg FDR to convert to q-values "
+  shortDescription = "takes a file with a list of p-values and applies " +\
+                     "Benjamini and Hochberg FDR to convert to q-values "
+
+  ui = CLI(programName, shortDescription, longDescription)
+  ui.minArgs = 2
+  ui.maxArgs = 2
+  ui.addOption(Option(short="o", long="output", argName="filename",
+                      description="output to given file, else stdout",
+                      required=False, type=str))
+  ui.addOption(Option(short="s", long="stranded",
+                      description="treat regions on separate strands as " +
+                                  "disjoint, even if they overlap",
+                                  required=False))
+  ui.addOption(Option(short="v", long="verbose",
+                      description="output additional messages to stderr " +
+                                  "about run", required=False))
+  ui.addOption(Option(short="h", long="help",
+                      description="show this help message ", special=True))
+  ui.addOption(Option(short="u", long="test",
+                      description="run unit tests ", special=True))
+
+  ui.parseCommandLine(args)
+  return ui
+
+
+################################################################################
+#                     COMMAND LINE PROCESSING AND DISPATCH                     #
+################################################################################
+
+def main(args):
+  """
+  main entry point for the GenomicIntIntersection script.
+
+  :param args: the arguments for this script, as a list of string. Should
+               already have had things like the script name stripped. That
+               is, if there are no args provided, this should be an empty
+               list.
+  """
+  # get options and arguments
+  ui = getUI(args)
+
+  if ui.optionIsSet("test"):
+    # just run unit tests
+    unittest.main(argv=[sys.argv[0]])
+  elif ui.optionIsSet("help"):
+    # just show help
+    ui.usage()
+  else:
+    verbose = ui.optionIsSet("verbose")
+
+    # stranded?
+    stranded = ui.optionIsSet("stranded")
+    if stranded:
+      sys.stderr.write("Sorry, stranded mode hasn't been implemented yet.")
+      sys.exit()
+
+    # get output handle
+    out_fh = sys.stdout
+    if ui.optionIsSet("output"):
+      out_fh = open(ui.getValue("output"), "w")
+
+    # get input file-handles -- we know we'll get exactly two, since we
+    # specified it in the UI definition
+    regions_1 = [x for x in BEDIterator(ui.getArgument(0), verbose=verbose)]
+    regions_2 = [x for x in BEDIterator(ui.getArgument(1), verbose=verbose)]
+
+    for r in regionsIntersection(regions_1, regions_2):
+      out_fh.write(str(r) + "\n")
+
+
+###############################################################################
+#                                UNIT TESTS                                   #
+###############################################################################
+
+class TestGenomicIntIntersection(unittest.TestCase):
+
+  """Unit tests for the GenomicIntIntersection program/script."""
+
+  def setUp(self):
+    f1_conts = "\n".join(["\t".join(["chr1", "10", "20", "F1_R1", "0", "+"]),
+                          "\t".join(["chr1", "70", "80", "F2_R2", "0", "+"]),
+                          "\t".join(["chr2", "05", "10", "F2_R2", "0", "+"]),
+                          "\t".join(["chr2", "70", "75", "F2_R2", "0", "+"]),
+                          "\t".join(["chr2", "90", "95", "F2_R2", "0", "+"])])
+    f2_conts = "\n".join(["\t".join(["chr1", "07", "12", "F1_R1", "0", "+"]),
+                          "\t".join(["chr1", "67", "70", "F2_R2", "0", "+"]),
+                          "\t".join(["chr1", "75", "85", "F2_R2", "0", "+"]),
+                          "\t".join(["chr2", "20", "30", "F2_R2", "0", "+"]),
+                          "\t".join(["chr2", "73", "92", "F2_R2", "0", "+"])])
+    self.str_d = {"file1.bed": f1_conts, "file2.bed": f2_conts}
+
+  @mock.patch('__builtin__.open')
+  def testTwoFiles(self, mock_open):
+    outfh = StringIO.StringIO()
+    stream_d = {"out.bed": outfh}
+    mock_open.side_effect = build_mock_open_side_effect(self.str_d, stream_d)
+    main(["-o", "out.bed", "file1.bed", "file2.bed"])
+    expect = "\n".join(["\t".join(["chr1", "10", "12", "X", "0", "+"]),
+                        "\t".join(["chr1", "75", "80", "X", "0", "+"]),
+                        "\t".join(["chr2", "73", "75", "X", "0", "+"]),
+                        "\t".join(["chr2", "90", "92", "X", "0", "+"])]) + "\n"
+    self.assertEqual(outfh.getvalue(), expect)
+
+
+###############################################################################
+#               ENTRY POINT WHEN RUN AS A STAND-ALONE MODULE                  #
+###############################################################################
+
+if __name__ == "__main__":
+    main(sys.argv[1:])
diff --git a/src/test.py b/src/test.py
index eaba3ff..8096ee3 100755
--- a/src/test.py
+++ b/src/test.py
@@ -92,6 +92,8 @@
 from pyokit.scripts.overlapProfile import TestOverlapProfile
 from pyokit.scripts.readCounts import ConvertJunctionsUnitTests
 from pyokit.scripts.readCountExonToGene import ExonToGeneReadCountTests
+from pyokit.scripts.genomicIntJaccard import TestGenomicIntJaccard
+from pyokit.scripts.genomicIntersection import TestGenomicIntIntersection
 from pyokit.scripts.pyokitMain import PyokitSmokeTests
 
 
@@ -151,6 +153,8 @@
   sys.stderr.write("  " + str(TestOverlapProfile) + "\n")
   sys.stderr.write("  " + str(ConvertJunctionsUnitTests) + "\n")
   sys.stderr.write("  " + str(ExonToGeneReadCountTests) + "\n")
+  sys.stderr.write("  " + str(TestGenomicIntJaccard) + "\n")
+  sys.stderr.write("  " + str(TestGenomicIntIntersection) + "\n")
   sys.stderr.write("  " + str(PyokitSmokeTests) + "\n\n")
 
   sys.stderr.write("\n\n RUNNING TESTS \n\n")