Which assessment focuses on a free interaction model with items?

The correct answer is the free-operant preference assessment, which is designed to allow individuals to engage with various items or activities without any restrictions on their choices or interactions. This type of assessment provides a naturalistic observation of preferences based on free interactions, enabling the observer to see which items the individual gravitates toward and engages with for an extended period.

During a free-operant preference assessment, individuals can choose and interact with items at their own pace, and the data collected reflects their spontaneous choices and interests. This model is particularly useful in determining preferences in a way that mimics real-life scenarios, helping practitioners understand what the individual may find reinforcing.

Other assessment types listed might involve structured choices or limitations on interactions, which do not provide the same level of insight into natural preferences as the free-operant method.