diff --git a/SimPEG/EM/Static/DC/ProblemDC.py b/SimPEG/EM/Static/DC/ProblemDC.py
index ff3fff0f..a31731a1 100644
--- a/SimPEG/EM/Static/DC/ProblemDC.py
+++ b/SimPEG/EM/Static/DC/ProblemDC.py
@@ -44,22 +44,47 @@ class BaseDCProblem(BaseEMProblem):
                 df_dmFun = getattr(f, '_%sDeriv'%rx.projField, None)
                 df_dm_v = df_dmFun(src, du_dm_v, v, adjoint=False)
                 Jv[src, rx] = rx.evalDeriv(src, self.mesh, f, df_dm_v)
-            Ainv.clean()
         return Utils.mkvc(Jv)
 
     def Jtvec(self, m, v, f=None):
-        raise NotImplementedError
+        if f is None:
+            f = self.fields(m)
+
+        self.curModel = m
+
+        # Ensure v is a data object.
+        if not isinstance(v, self.dataPair):
+            v = self.dataPair(self.survey, v)
+
+        Jtv = np.zeros(m.size)
+        AT = self.getA().T
+        ATinv = self.Solver(AT, **self.solverOpts)
+
+        for src in self.survey.srcList:
+            u_src = f[src, self._solutionType]
+            for rx in src.rxList:
+                PTv = rx.evalDeriv(src, self.mesh, f, v[src, rx], adjoint=True) # wrt f, need possibility wrt m
+                df_duTFun = getattr(f, '_%sDeriv'%rx.projField, None)
+                df_duT, df_dmT = df_duTFun(src, None, PTv, adjoint=True)
+
+                ATinvdf_duT = ATinv * df_duT
+
+                dA_dmT = self.getADeriv(u_src, ATinvdf_duT, adjoint=True)
+                dRHS_dmT = self.getRHSDeriv(src, ATinvdf_duT, adjoint=True)
+                du_dmT = -dA_dmT + dRHS_dmT
+                Jtv += df_dmT + du_dmT
+
+        return Utils.mkvc(Jtv)
 
     def getSourceTerm(self):
         """
         takes concept of source and turns it into a matrix
         """
         """
-        Evaluates the sources for a given frequency and puts them in matrix form
+        Evaluates the sources, and puts them in matrix form
 
-        :param float freq: Frequency
         :rtype: (numpy.ndarray, numpy.ndarray)
-        :return: s_m, s_e (nE or nF, nSrc)
+        :return: q (nC or nN, nSrc)
         """
 
         Srcs = self.survey.srcList
@@ -128,8 +153,10 @@ class Problem3D_N(BaseDCProblem):
         """
         Derivative of the right hand side with respect to the model
         """
-        qDeriv = src.evalDeriv(self, adjoint=adjoint)
-        return qDeriv
+        # TODO: add qDeriv for RHS depending on m
+        # qDeriv = src.evalDeriv(self, adjoint=adjoint)
+        # return qDeriv
+        return Zero()
 
 class Problem3D_CC(BaseDCProblem):
 
@@ -169,7 +196,7 @@ class Problem3D_CC(BaseDCProblem):
         if adjoint:
             # if self._makeASymmetric is True:
             #     v = V * v
-            return D * MfRhoIDeriv(D * v)
+            return( MfRhoIDeriv( D.T * u ).T) * ( D.T * v)
 
         # I think we should deprecate this for DC problem.
         # if self._makeASymmetric is True:
diff --git a/SimPEG/EM/Static/DC/RxDC.py b/SimPEG/EM/Static/DC/RxDC.py
index 7692c880..7d50392e 100644
--- a/SimPEG/EM/Static/DC/RxDC.py
+++ b/SimPEG/EM/Static/DC/RxDC.py
@@ -38,7 +38,13 @@ class BaseRx(SimPEG.Survey.BaseRx):
 
     def evalDeriv(self, src, mesh, f, v, adjoint=False):
         P = self.getP(mesh, self.projGLoc(f))
-        return P*v
+        if not adjoint:
+            return P*v
+        elif adjoint:
+            return P.T*v
+
+
+
 
 # DC.Rx.Dipole(locs)
 class Dipole(BaseRx):
diff --git a/tests/em/static/test_DC.py b/tests/em/static/test_DC.py
index 7de2ea45..6c777acf 100644
--- a/tests/em/static/test_DC.py
+++ b/tests/em/static/test_DC.py
@@ -47,31 +47,21 @@ class DCProblemTests(unittest.TestCase):
         passed = Tests.checkDerivative(derChk, self.m0, plotIt=False)
         self.assertTrue(passed)
 
-    # def test_adjoint(self):
-    #     # Adjoint Test
-    #     u = np.random.rand(self.mesh.nC*self.survey.nSrc)
-    #     v = np.random.rand(self.mesh.nC)
-    #     w = np.random.rand(self.survey.dobs.shape[0])
-    #     wtJv = w.dot(self.p.Jvec(self.m0, v))
-    #     vtJtw = v.dot(self.p.Jtvec(self.m0, w))
-    #     passed = np.abs(wtJv - vtJtw) < 1e-10
-    #     print 'Adjoint Test', np.abs(wtJv - vtJtw), passed
-    #     self.assertTrue(passed)
-
-    # def test_dataObj(self):
-    #     derChk = lambda m: [self.dmis.eval(m), self.dmis.evalDeriv(m)]
-    #     passed = Tests.checkDerivative(derChk, self.m0, plotIt=False)
-    #     self.assertTrue(passed)
-
-
-    # def test_massMatrices(self):
-    #     Gu = np.random.rand(self.mesh.nF)
-    #     def derChk(m):
-    #         self.p.curModel = m
-    #         return [self.p.Msig * Gu, self.p.dMdsig(Gu)]
-    #     passed = Tests.checkDerivative(derChk, self.m0, plotIt=False)
-    #     self.assertTrue(passed)
+    def test_adjoint(self):
+        # Adjoint Test
+        u = np.random.rand(self.mesh.nC*self.survey.nSrc)
+        v = np.random.rand(self.mesh.nC)
+        w = np.random.rand(self.survey.dobs.shape[0])
+        wtJv = w.dot(self.p.Jvec(self.m0, v))
+        vtJtw = v.dot(self.p.Jtvec(self.m0, w))
+        passed = np.abs(wtJv - vtJtw) < 1e-10
+        print 'Adjoint Test', np.abs(wtJv - vtJtw), passed
+        self.assertTrue(passed)
 
+    def test_dataObj(self):
+        derChk = lambda m: [self.dmis.eval(m), self.dmis.evalDeriv(m)]
+        passed = Tests.checkDerivative(derChk, self.m0, plotIt=False)
+        self.assertTrue(passed)
 
 if __name__ == '__main__':
     unittest.main()