Economics is a science grounded in the assumption that one fully grasps the underlying model and has all the relevant data—an ideal that is widely acknowledged as nearly unattainable. My research is driven by the development of methodologies that relax these assumptions. Currently, I am working on unobserved group-period fixed effects. This model accounts for individuals who are part of dynamic, unobserved groups, a factor which can introduce biases into our measurements. One of my aspirations for this research is that it addresses compliance issues, particularly in studies where individuals may change their adherence to treatment periodically in ways that are not directly observable.