In Iowa, Democratic and Republican caucuses each work a little bit differently.
Here's how a Republican caucus works in Iowa:
To determine presidential candidate preference, a straw poll is taken. Paper ballots are distributed and each person writes down who they think should be the nominee. The ballots are counted, and the results are called into a central location.
Delegates to the county convention will be elected from those present at the caucus. Delegates are not apportioned based on candidate preference.
After delegates are elected, the precinct chair will conduct party business, and open the floor to resolutions.