https://www.selleckchem.com/products/Vorinostat-saha.html Projected impacts are also influenced by assumptions made about agent (smoker) purchasing decision-making processes. In the absence of evidence in this area, we tested and compared three alternative decision rules; these interact with environmental properties to produce different results. Agent properties, namely income and cigarettes per day, also shape purchasing patterns before and after policy interventions. We conclude that agent-based modeling in general, and Tobacco Town specifically, hold much potential as a platform for testing and comparing the impact of various retail-based tobacco policies across different communities. Initial modeling efforts uncover important gaps in both data and theory and can provide guidance for new empirical studies in tobacco control. The experiences of people living with, or impacted by HIV, who participate in research and programming are relatively-well documented. However, how stakeholders within the HIV sector understand engagement, or how it functions discursively, is undertheorized. We used a comparative case study design and photovoice to explore engagement in three community-based organizations providing HIV programs or services in Toronto, Canada. We invited stakeholders to photograph their subjective understandings of engagement. We employ a visual and thematic analysis of our findings, by focusing on participants' use of journey metaphors to discuss engagement within and across sites. Visual metaphors of journey were employed by participants to make sense of their experience, and demonstrated that for many, engagement was a dynamic, affective and relational process. Our findings illustrate how journey may be an apt metaphor to explore the relational, contingent and socio-spatial/political specificities of engagement within and across HIV organizations. We conclude with a discussion on implications for practice. Spatial lifecourse epidemiology is an interdiscipli