The globally mushrooming Pentecostal-charismatic movement is a challenge, not only for the so-called mainline or historic churches, but also for the older traditional Pentecostal churches and also for the Mission Churches in the southern hemisphere who originate in the two former mentioned contributions in mission. Mostly these southern churches are independent in the meanwhile, but struggling for an authentic theological identity which is based in the scripture but is also able to respond to the questions of cultural and post-modern identity in the era of globalization. Focusing these developments in the multi-denominational and culturally diverse country of Tanzania might methodologically be a help as an example in a more and more complex world to avoid simplifying answers. My ecumenical concern is rooted in the insight that open culturally and socially diverse Christians all over the world are challenged to learn from each other in mutuality. What can I as a western German Lutheran learn from North American Pentecostals or from Tanzanian Christian believers? What could be my contribution to both of them especially concerning the question for a worldwide appropriate pneumatology?