Cover -- EDITORIAL ADVISORY BOARD -- What are unintended and adverse consequences? -- The unintended emergence of a greed-led economic system -- Unexpected consequences in the operation of urban environments -- The precautionary principle and unintended consequences -- A systemic and cybernetic perspective on causality, big data and social networks in tourism -- Unintended human-personal self destruction: can we save ourselves? -- Seeing through the eyes of the other -- Unintended consequences of special-needs law in Ireland and Sweden -- The systems approach to Irish society: 136 years of unintended consequences -- What are unintended and adverse consequences? -- 1. Introduction -- 2. Unintended consequences -- 3. Classification of unintended effects -- 4. Internal features -- 5. Reflections and conclusions -- References.