This article discusses the persistence and transformation of rain rituals in contemporary African Christianity. It argues that the concept 'hybridity' might be a useful addition to the vocabulary of scholars studying contemporary global Christianity. The use of hybridity could replace ideologically loaded terms, such as syncretism, while still describing the interaction between different religious traditions on the phenomenological level. In Africa, as elsewhere, there are ongoing internal dialogues between the often divergent traditions represented in the worldviews of contemporary Christians. Under the concept hybridity, this internal inter-religious dialogue might be well described using non-pejorative, empirical language.

The method presented here offers an effective and time saving tool for multivariable controller design. The relation between controller complexity and closed loop performance can easily be evaluated. The method consists of five steps: 1. A desired behavior of the closed loop system is specified. Considering the nonminimum phase part of the process model the closed loop attainable performance is determined. 2. The process model and the attainable performance are scaled by the RPN-scaling procedure. 3. This defines an "ideal" scaled controller, which is usually too complex to be realized. 4. The frequency response of the ideal scaled compensator is approximated by a simpler one with structure and order chosen by the user. 5. Since the approximation in frequency response is performed with the scaled system, it is necessary to return to the original system’s units.