premise: San Marco 1, also known as San Marco A, was the first Italian satellite, and the first non-Soviet/US spacecraft. Built in-house by the Italian Space Research Commission (Italian: "Commissione per le Ricerche Spaziali" , CRS) on behalf of the National Research Council, it was the first of five as part of the Italian-US San Marco programme.
hypothesis: Tthe Italian-US San Marco programme was deemed a failure.
reason: While the Italian-US San Marco programme did release five satellites, it was not clear if they were deemed as successful or as failures. I think the model was fooled because it assumed that because five were released that that meant it was a success.