diff --git a/src/CLImate.php b/src/CLImate.php
index a66c7721..634120d6 100644
--- a/src/CLImate.php
+++ b/src/CLImate.php
@@ -258,6 +258,11 @@ public function usage(array $argv = null)
         return $this->arguments->usage($this, $argv);
     }
 
+    public function command($name)
+    {
+        return new Command($name, $this);
+    }
+
     /**
      * Set the program's description
      *
diff --git a/src/Command.php b/src/Command.php
new file mode 100644
index 00000000..747038df
--- /dev/null
+++ b/src/Command.php
@@ -0,0 +1,247 @@
+<?php
+
+namespace League\CLImate;
+
+use League\CLImate\Argument\Argument;
+use League\CLImate\Argument\Filter;
+use League\CLImate\Argument\Parser;
+use League\CLImate\Argument\Summary;
+
+class Command
+{
+    /**
+     * @var string $name The name of the command.
+     */
+    private $name;
+
+    /**
+     * @var CLImate $climate The parent instance to handle output.
+     */
+    private $climate;
+
+    /**
+     * An array of arguments passed to the program.
+     *
+     * @var Argument[] $arguments
+     */
+    private $arguments = [];
+
+    /**
+     * A program's description.
+     *
+     * @var string $description
+     */
+    private $description;
+
+    /**
+     * Filter class to find various types of arguments
+     *
+     * @var \League\CLImate\Argument\Filter $filter
+     */
+    private $filter;
+
+    /**
+     * Summary builder class
+     *
+     * @var \League\CLImate\Argument\Summary $summary
+     */
+    private $summary;
+
+    /**
+     * Argument parser class
+     *
+     * @var \League\CLImate\Argument\Parser $parser
+     */
+    private $parser;
+
+    public function __construct($name, CLImate $climate)
+    {
+        $this->name = $name;
+        $this->climate = $climate;
+
+        $this->filter  = new Filter;
+        $this->summary = new Summary;
+        $this->parser  = new Parser;
+    }
+
+    /**
+     * Add an argument.
+     *
+     * @throws \Exception if $argument isn't an array or Argument object.
+     * @param Argument|string $argument
+     * @param $options
+     */
+    public function add($argument, array $options = [])
+    {
+        if (is_string($argument)) {
+            $argument = Argument::createFromArray($argument, $options);
+        }
+
+        if (!($argument instanceof Argument)) {
+            throw new \Exception('Please provide an argument name or object.');
+        }
+
+        $this->arguments[$argument->name()] = $argument;
+    }
+
+
+    /**
+     * Determine if an argument exists.
+     *
+     * @param string $name
+     * @return bool
+     */
+    public function exists($name)
+    {
+        return isset($this->arguments[$name]);
+    }
+
+
+    /**
+     * Retrieve an argument's value.
+     *
+     * @param string $name
+     * @return string|int|float|bool|null
+     */
+    public function get($name)
+    {
+        return isset($this->arguments[$name]) ? $this->arguments[$name]->value() : null;
+    }
+
+
+    /**
+     * Retrieve all arguments.
+     *
+     * @return Argument[]
+     */
+    public function all()
+    {
+        return $this->arguments;
+    }
+
+
+    /**
+     * Determine if an argument has been defined on the command line.
+     *
+     * This can be useful for making sure an argument is present on the command
+     * line before parse()'ing them into argument objects.
+     *
+     * @param string $name
+     * @param array $argv
+     *
+     * @return bool
+     */
+    public function defined($name, array $argv = null)
+    {
+        // The argument isn't defined if it's not defined by the calling code.
+        if (!$this->exists($name)) {
+            return false;
+        }
+
+        $argument = $this->arguments[$name];
+        $command_arguments = $this->parser->arguments($argv);
+
+        foreach ($command_arguments as $command_argument) {
+            if ($this->isArgument($argument, $command_argument)) {
+                return true;
+            }
+        }
+
+        return false;
+    }
+
+
+    /**
+     * Check if the defined argument matches the command argument.
+     *
+     * @param Argument $argument
+     * @param string $command_argument
+     *
+     * @return bool
+     */
+    private function isArgument($argument, $command_argument)
+    {
+        $possibilities = [
+            $argument->prefix()     => "-{$argument->prefix()}",
+            $argument->longPrefix() => "--{$argument->longPrefix()}",
+        ];
+
+        foreach ($possibilities as $key => $search) {
+            if ($key && strpos($command_argument, $search) === 0) {
+                return true;
+            }
+        }
+
+        return false;
+    }
+
+
+    /**
+     * Retrieve all arguments as key/value pairs.
+     *
+     * @return array
+     */
+    public function toArray()
+    {
+        $return = [];
+
+        foreach ($this->all() as $name => $argument) {
+            $return[$name] = $argument->value();
+        }
+
+        return $return;
+    }
+
+
+    /**
+     * Set a program's description.
+     *
+     * @param string $description
+     */
+    public function description($description)
+    {
+        $this->description = trim($description);
+    }
+
+
+    /**
+     * Output a script's usage statement.
+     *
+     * @param CLImate $climate
+     * @param array $argv
+     */
+    public function usage(CLImate $climate, array $argv = null)
+    {
+        $this->summary
+                ->setClimate($climate)
+                ->setDescription($this->description)
+                ->setCommand($this->parser->command($argv))
+                ->setFilter($this->filter, $this->all())
+                ->output();
+    }
+
+
+    /**
+     * Parse command line arguments into CLImate arguments.
+     *
+     * @throws \Exception if required arguments aren't defined.
+     * @param array $argv
+     */
+    public function parse(array $argv = null)
+    {
+        $this->parser->setFilter($this->filter, $this->all());
+
+        $this->parser->parse($argv);
+    }
+
+
+    /**
+     * Get the trailing arguments
+     *
+     * @return string|null
+     */
+    public function trailing()
+    {
+        return $this->parser->trailing();
+    }
+}