This is the 306th most frequent Finnish word.
toiminnan
"Toiminnan" means "of the activity" or "of the action" in English.
In this sentence, 'toiminnan' is used in a possessive sense to describe the effectiveness of the operation.
Johtaja korosti toiminnan tehokkuutta.
The manager emphasized the effectiveness of the operation.
Here, 'toiminnan' specifies that organizing relates to the activity.
Toiminnan järjestäminen vaatii huolellista suunnittelua.
Organizing the activity requires careful planning.
Here, 'toiminnan' functions as a genitive form of 'toiminta' to specify that the results belong to the activity.