diff --git a/src/Pipeline.php b/src/Pipeline.php
index 9cae43b..a1f0747 100644
--- a/src/Pipeline.php
+++ b/src/Pipeline.php
@@ -93,7 +93,7 @@ public function pipeline($pipeline) // : static
         return $this;
     }
 
-    public function addPipeline(self $pipeline) : int
+    public function addPipeline(PipelineInterface $pipeline) : int
     {
         $id = ++$this->lastPipeId;
 
diff --git a/src/PipelineFactory.php b/src/PipelineFactory.php
index 65568ec..a897799 100644
--- a/src/PipelineFactory.php
+++ b/src/PipelineFactory.php
@@ -5,9 +5,9 @@
 
 class PipelineFactory implements PipelineFactoryInterface
 {
-    public function newPipeline() : PipelineInterface
+    public function newPipeline(PipelineProcessorInterface $processor = null) : PipelineInterface
     {
-        $processor = $this->newPipelineProcessor();
+        $processor = $processor ?? $this->newPipelineProcessor();
 
         $pipeline = new Pipeline($processor);
 
@@ -21,4 +21,21 @@ public function newPipelineProcessor() : PipelineProcessorInterface
 
         return $pipelineProcessor;
     }
+
+
+    /**
+     * @template-covariant T of object
+     *
+     * @param class-string<T>|T $class
+     *
+     * @return T
+     */
+    public function newHandlerObject(string $class, array $parameters = []) : object
+    {
+        [ $list ] = Lib::array_kwargs($parameters);
+
+        $handler = new $class(...$list);
+
+        return $handler;
+    }
 }
diff --git a/src/PipelineFactoryInterface.php b/src/PipelineFactoryInterface.php
index c567ce5..eff9938 100644
--- a/src/PipelineFactoryInterface.php
+++ b/src/PipelineFactoryInterface.php
@@ -2,9 +2,11 @@
 
 namespace Gzhegow\Pipeline;
 
-/**
- * @mixin PipelineFactory
- */
 interface PipelineFactoryInterface
 {
+    public function newPipeline(PipelineProcessorInterface $processor = null) : PipelineInterface;
+
+    public function newPipelineProcessor() : PipelineProcessorInterface;
+
+    public function newHandlerObject(string $class, array $parameters = []) : object;
 }
diff --git a/src/PipelineInterface.php b/src/PipelineInterface.php
index 103d2bd..731b784 100644
--- a/src/PipelineInterface.php
+++ b/src/PipelineInterface.php
@@ -2,10 +2,46 @@
 
 namespace Gzhegow\Pipeline;
 
+use Gzhegow\Pipeline\Handler\Action\GenericAction;
+use Gzhegow\Pipeline\Handler\Fallback\GenericFallback;
+use Gzhegow\Pipeline\Handler\Middleware\GenericMiddleware;
+use Gzhegow\Pipeline\Exception\Exception\PipelineException;
+
 
-/**
- * @mixin Pipeline
- */
 interface PipelineInterface
 {
+    public function pipelines(array $pipelines);
+
+    public function pipeline($pipeline);
+
+    public function addPipeline(PipelineInterface $pipeline) : int;
+
+
+    public function middlewares(array $middlewares);
+
+    public function middleware($middleware);
+
+    public function addMiddleware(GenericMiddleware $middleware) : int;
+
+
+    public function actions(array $actions);
+
+    public function action($action);
+
+    public function addAction(GenericAction $action) : int;
+
+
+    public function fallbacks(array $fallbacks);
+
+    public function fallback($fallback);
+
+    public function addFallback(GenericFallback $fallback) : int;
+
+
+    /**
+     * @throws PipelineException
+     */
+    public function run($input = null, $context = null);
+
+    public function next($input = null, $context = null);
 }
diff --git a/src/PipelineProcessor.php b/src/PipelineProcessor.php
index 10a641a..083d35b 100644
--- a/src/PipelineProcessor.php
+++ b/src/PipelineProcessor.php
@@ -23,23 +23,6 @@ public function __construct(PipelineFactoryInterface $factory)
     }
 
 
-    /**
-     * @template-covariant T of object
-     *
-     * @param class-string<T>|T $class
-     *
-     * @return T
-     */
-    public function newHandlerObject(string $class, array $parameters = []) : object
-    {
-        [ $list ] = Lib::array_kwargs($parameters);
-
-        $handler = new $class(...$list);
-
-        return $handler;
-    }
-
-
     /**
      * @return array{ 0?: mixed }
      */
@@ -175,7 +158,7 @@ protected function extractHandlerCallable(GenericHandler $handler)
         } elseif ($handler->method) {
             $object = null
                 ?? $handler->methodObject
-                ?? $this->newHandlerObject($handler->methodClass);
+                ?? $this->factory->newHandlerObject($handler->methodClass);
 
             $method = $handler->methodName;
 
@@ -184,7 +167,7 @@ protected function extractHandlerCallable(GenericHandler $handler)
         } elseif ($handler->invokable) {
             $object = null
                 ?? $handler->invokableObject
-                ?? $this->newHandlerObject($handler->invokableClass);
+                ?? $this->factory->newHandlerObject($handler->invokableClass);
 
             $fn = $object;
 
@@ -194,8 +177,8 @@ protected function extractHandlerCallable(GenericHandler $handler)
 
         if (! is_callable($fn)) {
             throw new RuntimeException(
-                'Unable to extract callable from handler. '
-                . 'Handler: ' . Lib::php_var_dump($handler)
+                'Unable to extract callable from handler.'
+                . ' Handler: ' . Lib::php_var_dump($handler)
             );
         }
 
diff --git a/src/PipelineProcessorInterface.php b/src/PipelineProcessorInterface.php
index 2cc5398..6a8d1c2 100644
--- a/src/PipelineProcessorInterface.php
+++ b/src/PipelineProcessorInterface.php
@@ -9,16 +9,6 @@
 
 interface PipelineProcessorInterface
 {
-    /**
-     * @template-covariant T of object
-     *
-     * @param class-string<T>|T $class
-     *
-     * @return T
-     */
-    public function newHandlerObject(string $class, array $parameters = []) : object;
-
-
     /**
      * @return array{ 0?: mixed }
      */