| Subject | English | Spanish |
| comp., MS | optimistic concurrency | simultaneidad optimista (A method of managing concurrency by using a cached object's version information. Because every update to an object changes its version number, using version information prevents the update from overwriting someone else's changes) |
| IT, dat.proc. | optimistic duration | duración optimista |
| comp., MS | optimistic duration | duración ponderada (The best-case possibility for the total span of active working time expected for a task, that is, the amount of time from the optimistic start to optimistic finish of a task) |
| IMF. | optimistic scenario | escenario basado en la aplicación de políticas más favorables |
| IMF. | optimistic scenario | marco hipotético optimista |
| IMF. | optimistic scenario | escenario óptimo |
| IMF. | optimistic scenario | escenario optimista |