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+Task Kinds
+==========
+
+This section lists and documents the available task kinds.
+
+build
+------
+
+Builds are tasks that produce an installer or other output that can be run by
+users or automated tests.  This is more restrictive than most definitions of
+"build" in a Mozilla context: it does not include tasks that run build-like
+actions for static analysis or to produce instrumented artifacts.
+
+artifact-build
+--------------
+
+This kind performs an artifact build: one based on precompiled binaries
+discovered via the TaskCluster index.  This task verifies that such builds
+continue to work correctly.
+
+hazard
+------
+
+Hazard builds are similar to "regular' builds, but use a compiler extension to
+extract a bunch of data from the build and then analyze that data looking for
+hazardous behaviors.
+
+l10n
+----
+
+TBD (Callek)
+
+source-check
+------------
+
+Source-checks are tasks that look at the Gecko source directly to check
+correctness.  This can include linting, Python unit tests, source-code
+analysis, or measurement work -- basically anything that does not require a
+build.
+
+upload-symbols
+--------------
+
+Upload-symbols tasks run after builds and upload the symbols files generated by
+build tasks to Socorro for later use in crash analysis.
+
+valgrind
+--------
+
+Valgrind tasks produce builds instrumented by valgrind.
+
+static-analysis
+---------------
+
+Static analysis builds use the compiler to perform some detailed analysis of
+the source code while building.  The useful output from these tasks are their
+build logs, and while they produce a binary, they do not upload it as an
+artifact.
+
+toolchain
+---------
+
+Toolchain builds create the compiler toolchains used to build Firefox.  These
+will eventually be dependencies of the builds themselves, but for the moment
+are run manually via try pushes and the results uploaded to tooltool.
+
+spidermonkey
+------------
+
+Spidermonkey tasks check out the full gecko source tree, then compile only the
+spidermonkey portion.  Each task runs specific tests after the build.
+
+marionette-harness
+------------------
+
+TBD (Maja)
+
+Tests
+-----
+
+Test tasks for Gecko products are divided into several kinds, but share a
+common implementation.  The process goes like this, based on a set of YAML
+files named in ``kind.yml``:
+
+ * For each build task, determine the related test platforms based on the build
+   platform.  For example, a Windows 2010 build might be tested on Windows 7
+   and Windows 10.  Each test platform specifies a "test set" indicating which
+   tests to run.  This is configured in the file named
+   ``test-platforms.yml``.
+
+ * Each test set is expanded to a list of tests to run.  This is configured in
+   the file named by ``test-sets.yml``.
+
+ * Each named test is looked up in the file named by ``tests.yml`` to find a
+   test description.  This test description indicates what the test does, how
+   it is reported to treeherder, and how to perform the test, all in a
+   platform-independent fashion.
+
+ * Each test description is converted into one or more tasks.  This is
+   performed by a sequence of transforms defined in the ``transforms`` key in
+   ``kind.yml``.  See :doc:`transforms`: for more information on these
+   transforms.
+
+ * The resulting tasks become a part of the task graph.
+
+.. important::
+
+    This process generates *all* test jobs, regardless of tree or try syntax.
+    It is up to a later stage of the task-graph generation (the target set) to
+    select the tests that will actually be performed.
+
+desktop-test
+............
+
+The ``desktop-test`` kind defines tests for Desktop builds.  Its ``tests.yml``
+defines the full suite of desktop tests and their particulars, leaving it to
+the transforms to determine how those particulars apply to Linux, OS X, and
+Windows.
+
+android-test
+............
+
+The ``android-test`` kind defines tests for Android builds.
+
+It is very similar to ``desktop-test``, but the details of running the tests
+differ substantially, so they are defined separately.
+
+docker-image
+------------
+
+Tasks of the ``docker-image`` kind build the Docker images in which other
+Docker tasks run.
+
+The tasks to generate each docker image have predictable labels:
+``build-docker-image-<name>``.
+
+Docker images are built from subdirectories of ``testing/docker``, using
+``docker build``.  There is currently no capability for one Docker image to
+depend on another in-tree docker image, without uploading the latter to a
+Docker repository
+
+The task definition used to create the image-building tasks is given in
+``image.yml`` in the kind directory, and is interpreted as a :doc:`YAML
+Template <yaml-templates>`.