diff --git a/inc/class.course_slot.inc b/inc/class.course_slot.inc
new file mode 100644
--- /dev/null
+++ b/inc/class.course_slot.inc
@@ -0,0 +1,165 @@
+<?php
+/*
+ * Copyright 2011 Nathan Gelderloos, Ethan Zonca, Nathan Phillip Brink
+ *
+ * This file is part of SlatePermutate.
+ *
+ * SlatePermutate is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * SlatePermutate is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with SlatePermutate.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+require_once 'class.section.php';
+
+/**
+ * \brief
+ *   A package of Section objects of which one must be taken to sign
+ *   up for a particular Course.
+ *
+ * For example, some schools like umich have a single Course where one
+ * must sign up for one Section for every meeting_type of the
+ * following: 'lecture', 'discussion', and 'lab'. This way they avoid
+ * creating separate Course objects for labs (which is calvin's
+ * solution to the problem).
+ *
+ * Many schools do not have the CourseSlot paradigm. These will work
+ * just fine using one default CourseSlot.
+ *
+ * Iterating over this object will yield Section objects.
+ */
+class CourseSlot implements IteratorAggregate
+{
+  /**
+   * \brief
+   *   An array of Section objects associated with this CourseSlot.
+   */
+  private $sections;
+
+  /**
+   * \brief
+   *   An identifier for this slot. Used during crawling when sorting
+   *   Sections into CourseSlot objects.
+   */
+  private $id;
+
+  /**
+   * \brief
+   *   Creates a CourseSlot with the given identifier.
+   */
+  public function __construct($id)
+  {
+    $this->id = $id;
+  }
+
+  /**
+   * \brief
+   *   Required function to implement the IteratorAggregate interface.
+   */
+  public function getIterator()
+  {
+    return new ArrayIterator($this->sections);
+  }
+
+  /**
+   * \brief
+   *   Get the identifier of this slot.
+   *
+   * \return
+   *   The slot's identifier string.
+   */
+  public function id_get()
+  {
+    return $this->id;
+  }
+
+  /**
+   * \brief
+   *   Appends a Section to this CourseSlot.
+   *
+   * \param $section
+   *   The Section to append.
+   */
+  public function section_add(Section $section)
+  {
+    /*
+     * This behavior of the Schedule class requires this manner of
+     * indexing sections because it iterates using for ($count = 0;
+     * $count < ...) -style loops. Thus we allow PHP's natural
+     * indexing mechanism to do its job...
+     */
+    $this->sections[] = $section;
+  }
+
+  /**
+   * \brief
+   *    Returns the number of sections in the class.
+   */
+  function sections_count()
+  {
+    return count($this->sections);
+  }
+
+  /**
+   * \brief
+   *    Returns the desired section for analysis.
+   * \return
+   *    The selected section of the course.
+   */
+  function section_get_i($i)
+  {
+    $result = $this->sections[$i];
+    return $result;
+  }
+
+  /**
+   * \brief
+   *   Retrieve a section of this class based on its letter.
+   *
+   * \todo Make this function replace completely the getSection()
+   * function, have $this->sections be keyed by letter, and have a
+   * __wakup() convert the old $this->sections format to the new one.
+   *
+   * \return
+   *   The requested section or NULL if that section does not yet
+   *   exist for this class.
+   */
+  public function section_get($letter)
+  {
+    foreach ($this->sections as $section) {
+      if ($section->getLetter() == $letter) {
+	return $section;
+      }
+    }
+    return NULL;
+  }
+
+  /**
+   * \brief
+   *   Get the JSON arrays of data specific to each Section, adding
+   *   slight metadata for this SLOT.
+   *
+   * There is no corresponding from_json_arrays() function for this
+   * class. See Course::from_json_array() which manages the conversion
+   * of JSON slots to CourseSlot objects.
+   */
+  public function to_json_arrays()
+  {
+    $slot_section_json_arrays = array();
+    foreach ($this->sections as $section)
+      {
+	$section_json_arrays = $section->to_json_arrays();
+	foreach ($section_json_arrays as $section_json_array)
+	  $slot_section_json_arrays[] = $section_json_array + array('slot' => $this->id);
+      }
+    return $slot_section_json_arrays;
+  }
+}