1. Introduction 2. The source: Old English aelc and the system of quantification 2.1 Summary of key data - indeterminate pronouns 2.2 Summary of Analysis 3. The change: loss of the system during Middle English (ME) 3.1 Early ME 3.2 Late ME (LME) 4. Compositional semantic change 4.1 Analysis of the findings 4.2 Understanding the semantic change (the last step) Appendix Selected References