To demonstrate program reach and impact, outreach and engagement efforts must be quantified.

•Number of contacts—Each outreach worker should track the number of contacts they make with people during their outreach. Contacts may range from a brief description/offering of program services (e.g. syringe exchange, MOUD on-demand, access to primary care needs on the mobile unit, naloxone, etc.) to a lengthy engagement that results in the accessing of van services. Time likely will not permit outreach workers to collect additional data (e.g. name, sex, race/ethnicity, age, etc.) and it should be understood this statistic includes non-unique contacts.

•Syringe distribution—Each outreach worker should track the number of syringes distributed during each outreach session. As with the number of contacts, time likely will not permit outreach workers to collect additional demographic data.

•Naloxone distribution—Each outreach worker should track the number of naloxone kits distributed during each outreach session. Beyond the number of kits distributed, the evaluation team should consider what other metrics would be most critical to their evaluation while being minimally burdensome on the outreach team. Depending on the funding source for naloxone, there already may be reporting requirements to funders that include additional variables (e.g. whether the kit is a refill, how the previous kits were used, etc.), though these information reports may not be readily accessible for evaluation as the funder has ownership of the data. Other models of naloxone access, such as through facilitated pharmacy access, will not have associated formal data collection instruments.

•Syringe collection—The number of syringes collected from the streets and from people with SUD should be quantified. Due to logistical and safety concerns, it is unlikely that each collected syringe can be counted