Acknowledgements

The first investigation on this project was started during Marion Rauner's Erwin-Schroedinger Visting Scholarship, funded by the Austrian Science Fund, at the Department of Industrial Engineering and Engineering Management, Stanford University. We are grateful to Helmut Dier for his help in the development of the evaluation tool and to David Crabbe for his support in programming parts of the input and simulation tool. Thanks are also due to Ruth Davies and Margaret Brandeau for valuable comments on this work. We also thank our colleagues for providing us with the necessary computer power for the simulation runs. We are very grateful to Ruth Davies for allowing us to use the POST software and to Keith Cooper for his assistance in speeding up the simulation run times. We also thank the Evangelical Lutheran Church in Tanzania, the Christian Social Services Commission, the Gesellschaft fuer technische Zusammenarbeit (GtZ), the Institute of Medical Mission (DIFÄM) and the Evangelical Lutheran Church of Bavaria for enabling and funding the field work which was necessary to provide sufficient data for this work. We are also grateful to the Editor Ruth Davies and the anonymous reviewers for their most valuable comments on this paper.

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