Not realistic. Agile has many very good practices, but the ones that are missing are exactly the ones needed when you have a zero bug tolerance. You mention der

Not realistic. Agile has many very good practices, but the ones that are missing are exactly the ones needed when you have a zero bug tolerance. You mention derisking - creating a proof of concept (a short sprint that proves you can do something you're unsure about) is one way of eliminating risk. Agile however, includes no practices for identifying, analysing and managing risk. Similarly, absolute reliability requires upfront design, and documentation. See https://www.wittenburg.co.uk/Entry.aspx?id=99bb5987-e08d-4e81-974d-daa5e07c0d5f https://www.wittenburg.co.uk/Entry.aspx?id=99bb5987-e08d-4e8... .