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+=============
+Core Criteria
+=============
+
+.. contents::
+
+General
+=======
+
+This is a subcomponent of the larger `Core Definition
+<./CoreDefinition.rst>`_ documentation.
+
+Core Capability Selection uses 12 criteria grouped into four primary
+categories:
+
+1. Usage: the capability is widely used (Refstack will collect data)
+2. Direction: the capability advances OpenStack technically
+3. Community: the capability builds the OpenStack community experience
+4. System: the capability integrates with other parts of OpenStack
+
+These categories summarize critical values that we want in OpenStack and so
+make sense to be the primary factors used when we select core capabilities.
+While we strive to make the DefCore process objective and quantitive, we
+must recognize that these choices drive community behavior.
+
+.. figure:: images/Defcore_capabilities_criteria.png
+
+   Graphic showing Capabilities Seleciton Criteria
+
+Details
+=======
+
+With this perspective, let's review the selection criteria. To make it
+easier to cross reference, we've given each criteria a shortened name:
+
+SHOWS PROVEN USAGE
+------------------
+
+* "Widely Deployed" Candidates are widely deployed capabilities. We favor
+  capabilities that are supported by multiple public cloud providers and
+  private cloud products.
+
+* "Used by Tools" Candidates are widely used capabilities:Should be
+  included if supported by common tools (RightScale, Scalr, CloudForms,
+  ...)
+
+* "Used by Clients" Candidates are widely used capabilities: Should be
+  included if part of common libraries (Fog, Apache jclouds, etc)
+
+ALIGNS WITH TECHNICAL DIRECTION
+-------------------------------
+
+* "Future Direction" Should reflect future technical direction (from the
+  project technical teams and the TC) and help manage deprecated
+  capabilities.
+
+* "Stable" Test is required stable for >2 releases because we don't want
+  core capabilities that do not have dependable APIs.
+
+* "Complete" Where the code being tested has a designated area of alternate
+  implementation (extension framework) as per the Core Principles, there
+  should be parity in capability tested across extension implementations.
+  This also implies that the capability test is not configuration specific
+  or locked to non-open technology.
+
+PLAYS WELL WITH OTHERS
+----------------------
+
+* "Discoverable" Capability being tested is Service Discoverable (can be
+  found in Keystone and via service introspection)
+
+* "Doc'd" Should be well documented, particularly the expected behavior.
+  This can be a very subjective measure and we expect to refine this
+  definition over time.
+
+* "Core in Last Release" A test that is a must-pass test should stay a
+  must-pass test. This make makes core capabilities sticky release per
+  release. Leaving Core is disruptive to the ecosystem
+
+TAKES A SYSTEM VIEW
+-------------------
+
+* "Foundation" Test capabilities that are required by other must-pass tests
+  and/or depended on by many other capabilities
+
+* "Atomic" Capabilities is unique and cannot be build out of other
+  must-pass capabilities
+
+* "Proximity" (sometimes called a Test Cluster) selects for Capabilities
+  that are related to Core Capabilities. This helps ensure that related
+  capabilities are managed together.
+
+Note: The original 13th "non-admin" criteria has been removed because Admin
+APIs cannot be used for interoperability and cannot be considered Core.
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