Index: doc/models/cylinders.rst
===================================================================
--- doc/models/cylinders.rst	(revision 19dcb93366741a275baa8ad855ce8a310dca78f8)
+++ doc/models/cylinders.rst	(revision 19dcb93366741a275baa8ad855ce8a310dca78f8)
@@ -0,0 +1,11 @@
+.. _models-cylinders:
+
+**************
+Cylinder-based
+**************
+
+.. toctree::
+
+   ../model/cylinder.rst
+   ../model/capped_cylinder.rst
+   ../model/core_shell_cylinder.rst
Index: doc/models/ellipsoids.rst
===================================================================
--- doc/models/ellipsoids.rst	(revision 19dcb93366741a275baa8ad855ce8a310dca78f8)
+++ doc/models/ellipsoids.rst	(revision 19dcb93366741a275baa8ad855ce8a310dca78f8)
@@ -0,0 +1,10 @@
+.. _models-ellipsoids:
+
+***************
+Ellipsoid-based
+***************
+
+.. toctree::
+
+   ../model/ellipsoid.rst
+   ../model/triaxial_ellipsoid.rst
Index: doc/models/index.rst
===================================================================
--- doc/models/index.rst	(revision 19dcb93366741a275baa8ad855ce8a310dca78f8)
+++ doc/models/index.rst	(revision 19dcb93366741a275baa8ad855ce8a310dca78f8)
@@ -0,0 +1,11 @@
+*******************
+SAS Model Reference
+*******************
+
+.. toctree::
+   :numbered: 4
+   :maxdepth: 4
+
+   intro.rst
+   models.rst
+   refs.rst
Index: doc/models/intro.rst
===================================================================
--- doc/models/intro.rst	(revision 19dcb93366741a275baa8ad855ce8a310dca78f8)
+++ doc/models/intro.rst	(revision 19dcb93366741a275baa8ad855ce8a310dca78f8)
@@ -0,0 +1,49 @@
+
+.. _models-intro:
+
+************
+Introduction
+************
+
+Many of our models use the form factor calculations implemented in a c-library provided by the NIST Center for Neutron
+Research and thus some content and figures in this document are originated from or shared with the NIST SANS Igor-based
+analysis package.
+
+This software provides form factors for various particle shapes. After giving a mathematical definition of each model,
+we show the list of parameters available to the user. Validation plots for each model are also presented.
+
+Instructions on how to use SasView itself are available separately.
+
+To easily compare to the scattering intensity measured in experiments, we normalize the form factors by the volume of
+the particle
+
+.. math::
+
+    P(\vec q) = \frac{P_o(\vec q)}{V} = \frac{1}{V} F(\vec q) F^*(\vec q)
+
+with
+
+    F(\vec q) = \int\int\int dV\rho(\vec r) e^{-i\vec q \cdot \vec r}
+
+where $P_0(\vec q)$ is the un-normalized form factor, $\rho(\vec r)$ is the scattering length density at a given
+point in space and the integration is done over the volume $V$ of the scatterer.
+
+For systems without inter-particle interference, the form factors we provide can be related to the scattering intensity
+by the particle volume fraction
+
+.. math::
+
+    I(\vec q) = \Phi P(\vec q)
+
+Our so-called 1D scattering intensity functions provide $P(Q)$ for the case where the scatterer is randomly oriented. In
+that case, the scattering intensity only depends on the length of $Q$ . The intensity measured on the plane of the SAS
+detector will have an azimuthal symmetry around $Q=0$.
+
+Our so-called 2D scattering intensity functions provide $P(Q,\phi)$ for an oriented system as a function of a
+$q$ vector in the plane of the detector. We define the angle $\phi$ as the angle between the $q$ vector and the horizontal
+($x$) axis of the plane of the detector.
+
+For information about polarised and magnetic scattering, see here_.
+
+
+.. _here: polar_mag_help.html
Index: doc/models/lamellae.rst
===================================================================
--- doc/models/lamellae.rst	(revision 19dcb93366741a275baa8ad855ce8a310dca78f8)
+++ doc/models/lamellae.rst	(revision 19dcb93366741a275baa8ad855ce8a310dca78f8)
@@ -0,0 +1,9 @@
+.. _models-lamellae:
+
+**************
+Lamellae-based
+**************
+
+.. toctree::
+
+   ../model/lamellar.rst
Index: doc/models/models.rst
===================================================================
--- doc/models/models.rst	(revision 19dcb93366741a275baa8ad855ce8a310dca78f8)
+++ doc/models/models.rst	(revision 19dcb93366741a275baa8ad855ce8a310dca78f8)
@@ -0,0 +1,14 @@
+.. _models:
+
+******
+Models
+******
+
+.. toctree::
+   :numbered:
+   :maxdepth: 4
+
+   shapes.rst
+   independent.rst
+   structures.rst
+   custom.rst
Index: doc/models/refs.rst
===================================================================
--- doc/models/refs.rst	(revision 19dcb93366741a275baa8ad855ce8a310dca78f8)
+++ doc/models/refs.rst	(revision 19dcb93366741a275baa8ad855ce8a310dca78f8)
@@ -0,0 +1,35 @@
+.. _models-refs:
+
+**********
+References
+**********
+
+*Small-Angle Scattering of X-Rays*
+A Guinier and G Fournet
+John Wiley & Sons, New York (1955)
+
+P Stckel, R May, I Strell, Z Cejka, W Hoppe, H Heumann, W Zillig and H Crespi
+*Eur. J. Biochem.*, 112, (1980), 411-417
+
+G Porod
+in *Small Angle X-ray Scattering*
+(editors) O Glatter and O Kratky
+Academic Press (1982)
+
+*Structure Analysis by Small-Angle X-Ray and Neutron Scattering*
+L.A Feigin and D I Svergun
+Plenum Press, New York (1987)
+
+S Hansen
+*J. Appl. Cryst.* 23, (1990), 344-346
+
+S J Henderson
+*Biophys. J.* 70, (1996), 1618-1627
+
+B C McAlister and B P Grady
+*J. Appl. Cryst.* 31, (1998), 594-599
+
+S R Kline
+*J Appl. Cryst.* 39(6), (2006), 895
+
+**Also see the references at the end of the each model function descriptions.**
Index: doc/models/shapes.rst
===================================================================
--- doc/models/shapes.rst	(revision 19dcb93366741a275baa8ad855ce8a310dca78f8)
+++ doc/models/shapes.rst	(revision 19dcb93366741a275baa8ad855ce8a310dca78f8)
@@ -0,0 +1,15 @@
+.. _models-shapes:
+
+******************
+Shape-based Models
+******************
+
+.. toctree::
+
+    spheres.rst
+    cylinders.rst
+    ellipsoids.rst
+    lamellae.rst
+    paracrystals.rst
+    parallelpipeds.rst
+
Index: doc/models/spheres.rst
===================================================================
--- doc/models/spheres.rst	(revision 19dcb93366741a275baa8ad855ce8a310dca78f8)
+++ doc/models/spheres.rst	(revision 19dcb93366741a275baa8ad855ce8a310dca78f8)
@@ -0,0 +1,10 @@
+.. _models-spheres:
+
+***************
+Sphere-based
+***************
+
+.. toctree::
+
+   ../model/sphere.rst
+
