diff --git a/classes/condition.php b/classes/condition.php
new file mode 100644
index 0000000..3eaf511
--- /dev/null
+++ b/classes/condition.php
@@ -0,0 +1,55 @@
+<?php
+// This file is part of Moodle - http://moodle.org/
+//
+// Moodle is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// Moodle 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 General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
+
+namespace classes;
+
+use core\persistent;
+
+/**
+ * Conditions persistent
+ *
+ * @package     tool_dynamic_cohorts
+ * @copyright   2024 Catalyst IT
+ * @license     https://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+class condition extends persistent {
+
+    /** @var string table. */
+    const TABLE = 'tool_dynamic_cohorts_c';
+
+    /**
+     * Return the definition of the properties of this model.
+     *
+     * @return array
+     */
+    protected static function define_properties() {
+        return [
+            'ruleid' => [
+                'type' => PARAM_INT,
+            ],
+            'classname' => [
+                'type' => PARAM_TEXT,
+            ],
+            'configdata' => [
+                'type' => PARAM_RAW,
+                'default' => '{}',
+            ],
+            'sortorder' => [
+                'type' => PARAM_INT,
+            ],
+        ];
+    }
+}
diff --git a/classes/rule.php b/classes/rule.php
new file mode 100644
index 0000000..1e1b281
--- /dev/null
+++ b/classes/rule.php
@@ -0,0 +1,97 @@
+<?php
+// This file is part of Moodle - http://moodle.org/
+//
+// Moodle is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// Moodle 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 General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
+
+namespace classes;
+
+use core\persistent;
+
+/**
+ * Rules persistent
+ *
+ * @package     tool_dynamic_cohorts
+ * @copyright   2024 Catalyst IT
+ * @license     https://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+class rule extends persistent {
+
+    /** @var string table. */
+    const TABLE = 'tool_dynamic_cohorts';
+
+    /**
+     * Return the definition of the properties of this model.
+     *
+     * @return array
+     */
+    protected static function define_properties() {
+        return [
+            'name' => [
+                'type' => PARAM_TEXT,
+            ],
+            'description' => [
+                'type' => PARAM_TEXT,
+                'default' => null,
+                'null' => NULL_ALLOWED,
+            ],
+            'cohortid' => [
+                'type' => PARAM_INT,
+                'default' => 0,
+            ],
+            'enabled' => [
+                'type' => PARAM_INT,
+                'default' => 0,
+            ],
+            'bulkprocessing' => [
+                'type' => PARAM_INT,
+                'default' => 0,
+            ],
+            'broken' => [
+                'type' => PARAM_INT,
+                'default' => 0,
+            ],
+        ];
+    }
+
+    /**
+     * Get a list of condition records for that rule.
+     *
+     * @return condition[]
+     */
+    public function get_condition_records(): array {
+        $conditions = [];
+        foreach (condition::get_records(['ruleid' => $this->get('id')], 'position') as $condition) {
+            $conditions[$condition->get('id')] = $condition;
+        }
+
+        return $conditions;
+    }
+
+    /**
+     * Return if the rule is enabled.
+     *
+     * @return bool
+     */
+    public function is_enabled() : bool {
+        return (bool)$this->get('enabled');
+    }
+
+    /**
+     * Check if this rule should process in bulk.
+     * @return bool
+     */
+    public function is_bulk_processing(): bool {
+        return (bool) $this->get('bulkprocessing');
+    }
+}