Since 1985 , the `` Britannica '' has had four parts : the `` Micropædia '' , the `` Macropædia '' , the `` Propædia '' , and a two-volume index .
Since 1985 , the `` Britannica '' has had four parts : the `` Micropædia , '' the `` Macropædia , '' the `` Propædia , '' and a two-book index .