Rule reminder
Advanced Italian nominal style frequently employs three or more levels of genitive chaining: 'la valutazione dell'efficacia degli interventi' = evaluation (of the effectiveness (of the interventions)). This structure avoids relative clauses ('i risultati degli interventi che sono stati valutati per la loro efficacia'). Master-level learners must recognise and produce these chains accurately, paying attention to article agreement at each level.
The meaning is: 'evaluating how effective the training programmes are'. Which chain is correct?