diff --git a/inst/cta/test/test_irf_trafo.py b/inst/cta/test/test_irf_trafo.py
new file mode 100755
index 0000000..15c84e7
--- /dev/null
+++ b/inst/cta/test/test_irf_trafo.py
@@ -0,0 +1,67 @@
+#! /usr/bin/env python
+# ===========================================================================================#
+# Test coordinate transformations for IRF computation.
+# ===========================================================================================#
+from gammalib import *
+from math import *
+
+
+# ====================== #
+# Compute Omega0 #
+# ====================== #
+def omega0():
+	"""
+	...
+	"""
+	# Set pointing direction
+	pointing = GSkyDir()
+	pointing.radec_deg(10.0, 10.0)
+
+	# Set model centre
+	model = GSkyDir()
+	model.radec_deg(12.0, 10.0)
+
+	# Set measured photon direction
+	p = GSkyDir()
+	p.radec_deg(13.0, 9.0)
+	
+	# Determine angular distance between measured photon direction and model centre
+	zeta = model.dist(p)
+	
+	# Determine angular distance between measured photon direction and pointing direction
+	eta = pointing.dist(p)
+	
+	# Determine angular distance between model centre and pointing direction
+	lamda = model.dist(pointing)
+	
+	# Compute Omega0
+	omega0 = 0.0
+	omega2 = 0.0
+	denom  = sin(lamda) * sin(zeta)
+	if denom != 0.0:
+		arg    = (cos(eta) - cos(lamda) * cos(zeta))/denom
+		arg2   = cos(eta)/denom - 1./(tan(lamda) * tan(zeta))
+		omega0 = acos(arg)
+		omega2 = acos(arg2)
+	
+	# Print results
+	print "Omega0 ...: ", omega0*180.0/pi
+	print "Omega0 ...: ", omega2*180.0/pi
+	print "Zeta .....: ", zeta
+	print "Eta ......: ", eta
+	print "Lambda ...: ", lamda
+	
+	# Return
+	return
+
+
+
+#==========================#
+# Main routine entry point #
+#==========================#
+if __name__ == '__main__':
+	"""
+	...
+	"""
+	# ...
+	omega0()
diff --git a/inst/cta/test/test_npred_computation.py b/inst/cta/test/test_npred_computation.py
new file mode 100755
index 0000000..890ba71
--- /dev/null
+++ b/inst/cta/test/test_npred_computation.py
@@ -0,0 +1,112 @@
+#! /usr/bin/env python
+# ==========================================================================
+# This script tests the Npred computation of the CTA response.
+#
+# Copyright (C) 2011 Jurgen Knodlseder
+#
+# 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/>.
+#
+# ==========================================================================
+from gammalib import *
+import math
+import os
+import glob
+import sys
+
+# Optionally import matplotlib if available
+try:
+	import matplotlib.pyplot as plt
+	has_matplotlib = True
+except ImportError:
+	print "WARNING: Matplotlib not available for plotting."
+	has_matplotlib = False
+
+
+# ======================================= #
+# Compute NPsf as function of PSF position #
+# ======================================= #
+def npsf(caldb, irf, radius):
+	"""
+	"""
+	# Setup CTA response
+	rsp = GCTAResponse(irf, caldb)
+	
+	# Setup ROI
+	instDir = GCTAInstDir()
+	instDir.radec_deg(0.0, 0.0)
+	roi = GCTARoi()
+	roi.centre(instDir)
+	roi.radius(radius)
+	
+	# Setup source energy
+	srcEng = GEnergy()
+	srcEng.TeV(0.1)
+
+	# Setup dummy time and pointing
+	srcTime = GTime()
+	pnt     = GCTAPointing()
+	
+	# Compute PSF as function of offset
+	x = []
+	y = []
+	for i in range(150):
+		
+		# Compute offset angle
+		offset = i*radius/100.0
+		
+		# Set PSF position
+		srcDir = GSkyDir()
+		srcDir.radec_deg(0.0, offset)
+		
+		# Compute NPsf
+		npsf = rsp.npsf(srcDir, srcEng.log10TeV(), srcTime, pnt, roi)
+
+		# Store results
+		x.append(offset)
+		y.append(npsf)
+		#print offset, npsf
+	
+	# Optionally plot results
+	if has_matplotlib:
+		
+		# Create figure
+		plt.figure(1)
+		plt.title("NPsf")
+
+		# Plot data
+		plt.plot(x, y, 'r-')
+		plt.plot([radius,radius], [0.0,1.0], 'b-')
+				
+		# Set axes
+		plt.xlabel("Offset angle (deg)")
+		plt.ylabel("Npsf")
+		
+		# Show plot
+		plt.show()
+
+		
+	
+
+#==========================#
+# Main routine entry point #
+#==========================#
+if __name__ == '__main__':
+	"""
+	"""
+	# Set response information
+	caldb = "$GAMMALIB/share/caldb/cta"
+	irf   = "kb_E_50h_v3"
+	
+	# Compute NPsf
+	npsf(caldb, irf, 1.0)