在现代社会,一个坚持自己的理念并寻求以之影响和改变社会的政党必须根据时代的变化调整自己的定位和政治战略。这方面,作为欧洲百年大党的欧洲社会民主党(这里泛指作为战后社会党国际成员的政党,名称上各国有社会民主党、工党、社会党之不同)有其成功的经验。它们从早期的带有激进色彩的工人党发展到了今天作为中左翼政治代表的稳定执政力量。在此过程中,社会民主党经历了三次大的历史转型。 In modern society, a political party that insists on its own ideas and seeks to influence and change society must adjust its positioning and political strategy in light of changes in the times. In this regard, the European Social Democrats (collectively referred to here as political parties serving as international members of the post-World War I party, with the names of Social Democrats, Labor Parties and Socialist Parties in various countries) have had successful experiences as European centennials. They have evolved from the early pro-radical Workers Party to the stable governing power that serves as the center-left political representative today. In the process, the Social Democrats experienced three major historical changes.