Final answer:
The Transtheoretical Model (TTM) assumes that change occurs over time through stages, requires different intervention strategies, is not linear with potential for relapse, and is influenced by decisional balance and self-efficacy.
Step-by-step explanation:
The transtheoretical model (TTM), also known as the Stages of Change model, is rooted in several key assumptions. First, it posits that change is a process that unfolds over time through a sequence of stages. These stages include precontemplation, contemplation, preparation, action, and maintenance. The model assumes that individuals move through these stages at their own pace and may cycle through them several times before achieving lasting change.
Another assumption of the TTM is that different intervention strategies are needed at different stages of change. For example, someone in the precontemplation stage may benefit from strategies to raise awareness of the need for change, whereas someone in the action stage may require support for taking concrete steps.
An additional assumption is that progress through the stages of change is not linear. Individuals can relapse and fall back to an earlier stage. The model accounts for this by incorporating strategies for relapse prevention and resilience.
Finally, the TTM assumes that decisional balance—weighing the pros and cons of changing behavior—is a key factor affecting progression through the stages, as is self-efficacy, or the individual's confidence in their ability to change.