This is the 1387th most frequent Polish word.
skuteczne
Effective.
Here 'skuteczne' acts as an adjective modifying 'metody', meaning effective or successful in achieving the desired outcome.
Metody nauczania stosowane w tej szkole są bardzo skuteczne.
The teaching methods used in this school are very effective.
In this context, 'skuteczne' is used as an adjective describing 'działanie', indicating efficiency in purpose fulfillment.
Skuteczne działanie jest kluczowe w rozwiązywaniu problemów.
Effective action is key in solving problems.
Here, 'skuteczne' describes 'zarządzanie', again implying proficiency and success in the described action.