A survey of more than 250 ship conversions between 1980 and 1990 is presented. Conversions are defined as jumboizations of hulls, changes of missions of ship with or without major structural changes, and major reconstruction of cruise liners and passenger ferries. From reports publishd in maritime journals, a database has been established, allowing for analysis of various ratios, principal particulars, and mission changes. Whenever available, evolution of conversion cost and duration over time as well as age, country of build, and converting shipyard are considered. Conclusions are drawn from comparisons of our database with the world fleet. Finally trends in the ship conversion market are discussed.
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