diff --git a/TODO.org b/TODO.org
index 98462c9..2b8c164 100644
--- a/TODO.org
+++ b/TODO.org
@@ -7,4 +7,5 @@
 *** TODO add support to main todo repository and collect todo form projects repositories
 ** TODO add startup custom buffer for kuso
 ** TODO add per project configuration support
+** TODO configure `package-archive-priorities` so package.el install all packages from elpa first
 * Release
diff --git a/fg42-config.el b/fg42-config.el
index 1ce4deb..521adde 100644
--- a/fg42-config.el
+++ b/fg42-config.el
@@ -2,6 +2,7 @@
 (toggle-debug-on-error)
 (require 'fg42)
 
-(activate-extensions 'editor)
+(activate-extensions 'editor
+                     'development)
 
 (fg42-initialize)
diff --git a/lib/extensions/development.el b/lib/extensions/development.el
new file mode 100644
index 0000000..3c96499
--- /dev/null
+++ b/lib/extensions/development.el
@@ -0,0 +1,20 @@
+(require 'fpkg)
+(require 'fg42/extension)
+(require 'extensions/development/init)
+
+;; Dependencies ----------------------------------
+(depends-on 'flycheck)
+(depends-on 'company)
+(depends-on 'projectile)
+(depends-on 'flyspell)
+(depends-on 'diff-hl)
+(depends-on 'magit)
+(depends-on 'indent-guide)
+(depends-on 'yasnippet)
+
+;; Extension -------------------------------------
+(extension development
+	   :version "2.67"
+	   :on-initialize extension/development-initialize)
+
+(provide 'extensions/development)
diff --git a/lib/extensions/development/init.el b/lib/extensions/development/init.el
new file mode 100644
index 0000000..faf79df
--- /dev/null
+++ b/lib/extensions/development/init.el
@@ -0,0 +1,34 @@
+;; Functions -------------------------------------------------
+
+;; Quick fix for company-mode and yasnippet clashing
+(defun company-yasnippet-or-completion ()
+  (interactive)
+  (if (yas/expansion-at-point)
+      (progn (company-abort)
+             (yas/expand))
+    (company-complete-common)))
+
+(defun yas/expansion-at-point ()
+  "Tested with v0.6.1. Extracted from `yas/expand-1'"
+  (first (yas/current-key)))
+
+;;;###autoload
+(defun extension/development-initialize ()
+  "Development plugin initialization."
+  (message "Initializing 'development' extension.")
+
+  (ability code-completion ()
+           (global-company-mode t)
+           (define-key company-active-map "\t" 'company-yasnippet-or-completion))
+
+  (ability yas ()
+           (yas-global-mode 1))
+
+  (ability project-management ()
+           (projectile-global-mode)
+           (setq projectile-enable-caching t))
+
+
+
+)
+(provide 'extensions/development/init)
diff --git a/lib/fg42/extension.el b/lib/fg42/extension.el
index ed79123..133ee16 100644
--- a/lib/fg42/extension.el
+++ b/lib/fg42/extension.el
@@ -5,6 +5,9 @@
 (defvar activated-extensions ()
   "A list of all activated extensions.")
 
+(defvar disabled-abilities (make-hash-table)
+  "A hash of all the disabled abilities")
+
 ;; Structures -----------------------------
 (cl-defstruct fg42-extension
   "Each FG42 extension should implement a copy of this structure."
@@ -14,6 +17,26 @@
   (on-initialize nil)
   (on-load))
 
+
+;; Functions ------------------------------
+
+(defun active-ability? (name)
+  "Return t if ability was not in disabled-abilities."
+  (if (gethash name disabled-abilities) nil t))
+
+(defmacro ability (name deps &rest body)
+  "Define an ability with the given name.
+
+*deps* should be a list of abilities with the defined ability dependens
+to them.
+
+*body* is a block of code which will run as the ability initializer code."
+  `(progn
+     (message "00000 %s" (active-ability? (intern ,(symbol-name name))))
+     (if (active-ability? (intern ,(symbol-name name)))
+       (if (null (delq t (mapcar 'active-ability? ,deps)))
+           ,@body))))
+
 (defmacro extension (name &rest args)
   "A simple DSL to define new fg42 extension."
   `(setq ,name (apply 'make-fg42-extension :name ,(symbol-name name) (quote ,args))))