Acknowledgements

• Friederike Hammer for efforts towards making Stratify well-known and for general support.
• Günter Merboth and Clive Bridger for correcting parts of my English texts
• Stratify users Roz Aitken and her colleague Prasun Amin at the Museum of London for helpful suggestions
• Julien Denis for helpful comments and suggestions
• Andrew Wilson, Oxford, for problem reports and helpful suggestions
• Walter Gauss, Aegina, Greece, for testing the DXF export many many times and for suggestions
• Benjamin Ducke, Kiel/Oxford, for problem reports and helpful suggestions
• Raimundo Ortiz, for providing information on installing Stratify on a 64 bit machine
• All other colleagues who supported me in writing the program and discussed the aims and some of the problems with me.

Thank you all!