diff --git a/src/vnext/vnext_backend.py b/src/vnext/vnext_backend.py
new file mode 100644
index 0000000..44c961d
--- /dev/null
+++ b/src/vnext/vnext_backend.py
@@ -0,0 +1,73 @@
+def vnextview(runs=1, rune=None, chopruns=None, runv=None, norm=None, pc=None, minv=None, maxv=None):
+    """View one GSAS gda data pattern after binning as histogram data:
+    Parameters
+    - runs (int): Start run number
+    - rune (int | None): End run number
+    - chopruns (int | None): Chopruns where data are chopped from
+    - runv (int  | None): Vanadium data for normalization
+    - norm (int| None): Normalize data over proton charge charge read from xml
+    - pc (int  | None):  Normalize with proton charge
+    - minv (float | None): Cutoff of x axis
+    - maxv (float | None):Cutoff of x axis."""
+    raise NotImplementedError("Implement view")
+
+
+def vnextbin(runs=1, rune=None, chopruns=None):
+    """Bin event data to GSAS histogram files if not binned before:
+    Parameters
+    - runs (int): Start run number
+    - rune (int | None): End run number
+    - chopruns (int | None): Chopruns where data are chopped from"""
+    raise NotImplementedError("Implement vbin")
+
+
+def vnextchop(runs=1, dbin=1, minv=None, maxv=None):
+    """Chop wall clock time , synchronize, and bin continuously collected data in seconds
+    Parameters
+    - runs (int): Start run number
+    - minv (float | None): minimum value
+    - maxv (float | None):maximum value
+    - dbin(float| None): time bin"""
+    raise NotImplementedError("Implement chop")
+
+
+def vnextchopse(runs=1, se="Temperature", dse=1, minv=None, maxv=None):
+    """Chop sample environment , synchronize, and bin continuously collected data in seconds
+    Parameters
+    - runs (int): Start run number
+    -se(str): name of sample environment to be chopped
+    - minv (float | None): minimum value
+    - maxv (float | None):maximum value
+    - dse(float| None): sample environment bin"""
+    raise NotImplementedError("Implement chopse")
+
+
+def vnextspf(
+    runs=1, rune=None, chopruns=None, runv=None, runr=None, pc=None, norm=None, updated=None, autofix=None, npeaks=None
+):
+    """Conduct GSAS single peak fit:
+    Parameters
+    - runs (int): Start run number
+    - rune (int | None): End run number
+    - chopruns (int | None): Chopruns where data are chopped from
+    - runv (int  | None): Vanadium data for normalization
+    - norm (int| None): Normalize data over proton charge charge read from xml
+    - pc (int  | None):  Normalize with proton charge
+    - runr(int | None): reference run number to calculate strain, default is the first run
+    - updatedp(int /None):  update peak positions
+    - autofix (int| None):
+    - autopeak (int | None):automatically find peak wi
+    - npeaks (float | None):number of peaks to automatically generate.
+    """
+    raise NotImplementedError("Implement single peak fit")
+
+
+def vnextgsas(runs=1, rune=None, choprun=None, runm=None):
+    """Conduct GSAS Rietveld refinement:
+    Parameters
+    - runs (int): Start run number
+    - rune (int | None): End run number
+    - chopruns (int | None): Chopruns where data are chopped from
+    - runm (int  | None): Template run default is first one"""
+
+    raise NotImplementedError("Implement gsas")