I. Common Traits of the Classical Systems of Ethics: An Introductory Letter About what will not be Said.- II. Five Epistemological Notes About Good and Evil.- 1. The Development of a Person's Sense of Morality.- 2. The Ideals.- 3. The Logical Role of the Ideals.- 4. The Essence of the Good. The Meaningless.- 5. The Development of the Epistemology of Morality.- III. The Ethics of Decisions: A Dialog on Demystified Ethics.- 1. Whether investigations according to the principles suggested in the preceding notes belong to ethics at all.- 2. Whether there do not exist still other ethical questions.- 3. Whether ethics is analogous to geometry.- 4. Whether systems of norms might not be combined by logical operations.- 5. Whether decisions are the only basis for morality.- 6. Whether rational foundations for decisions are possible.- 7. What role faith plays in morality.- 8. What demystified ethics might be able to achieve....- 9. ... except for a logic of norms.- 10. ... and except for a logic of desires.- IV. Five Logico-mathematical Notes on Voluntary Associations.- 1. The Partitions of People Induced by Norms.- 2. Duality.- 3. Disjunctive Norms.- 4. A Person's Demands on Himself and on Others.- 5. Several Modes of Behavior.- V. Logic, Imagination, Reality, Evaluations: A Concluding Letter about what has been said.- Postscript to the English Edition.- Karl Menger: Principal Dates.- Fields of Research.- Publications in Book Form.