eng: Split up requirements engineering chapter

This allows to more easily generate the specification item section with
a script using specification items.

Update #3715.

1 files changed, 46 insertions, 0 deletions

diff --git a/eng/req/validation.rst b/eng/req/validation.rst
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+.. SPDX-License-Identifier: CC-BY-SA-4.0
+
+.. Copyright (C) 2019, 2020 embedded brains GmbH (http://www.embedded-brains.de)
+
+.. _ReqEngValidation:
+
+Requirement Validation
+======================
+
+The validation of each requirement shall be accomplished by one or more of
+the following methods and nothing else:
+
+* *By test*: A :ref:`ReqEngTestCase` specification item is provided to
+  demonstrate that the requirement is satisfied when the software product is
+  executed on the target platform.
+
+* *By analysis*: A statement is provided how the requirement is met, by
+  analysing static properties of the software product.
+
+* *By inspection*: A statement is provided how the requirement is met, by
+  inspection of the :term:`source code`.
+
+* *By review of design*: A rationale is provided to demonstrate how the
+  qualification requirement is satisfied implicitly by the software design.
+
+Validation by test is strongly recommended.  The choice of any other validation
+method shall be strongly justified.  The requirements author is obligated to
+provide the means to validate the requirement with detailed instructions.
+
+For a specification item in a parent directory it could be checked that at
+least one item in a subdirectory has a link to it.  For example a subdirectory
+could contain validation items.  With this feature you could check that all
+requirements are covered by at least one validation item.
+
+The requirement validation by analysis, by inspection, and by design
+specification items shall have the following attribute specializations:
+
+type
+    The type attribute value shall be *validation-by-analysis*,
+    *validation-by-inspection*, or *validation-by-review-of-design*.
+
+link
+    There shall be exactly one link to the validated requirement.
+
+text
+    The statement or rational of the requirement validation.