I have swapped the content of "Specification and Description Language" and "Specifciation and Design Language" MJ 19. 12. 2006 "Specifciation and Design Language" now redirects to "Specification and Description Language".
I think SDL refered at beginning to the term "Specifciation and Design Language", if this is the case, please make a note on the "Specification and Description Language" page. If that was not the case, the page "Specifciation and Design Language" should be removed.