--- /dev/null
+<?php
+
+/*
+ * This file is part of the Behat.
+ * (c) Konstantin Kudryashov <ever.zet@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Behat\Testwork\Ordering\Orderer;
+
+use Behat\Testwork\Specification\SpecificationIterator;
+
+/**
+ * Algorithm for prioritising Specification execution
+ *
+ * @author Ciaran McNulty <mail@ciaranmcnulty.com>
+ */
+interface Orderer
+{
+ /**
+ * @param SpecificationIterator[] $scenarioIterators
+ * @return SpecificationIterator[]
+ */
+ public function order(array $scenarioIterators);
+
+ /**
+ * @return string
+ */
+ public function getName();
+}