  This paper introduces ontological concepts required to evaluate and manage
the coverage of social services in a Smart City context. Here, we focus on the
perspective of key stakeholders, namely social purpose organizations and the
clients they serve. The Compass ontology presented here extends the Common
Impact Data Standard by introducing new concepts related to key dimensions: the
who (Stakeholder), the what (Need, Need Satisfier, Outcome), the how (Service,
Event), and the contributions (tracking resources). The paper first introduces
key stakeholders, services, outcomes, events, needs and need satisfiers, along
with their definitions. Second, a subset of competency questions are presented
to illustrate the types of questions key stakeholders have posed. Third, the
extension's ability to answer questions is evaluated by presenting SPARQL
queries executed on a Compass-based knowledge graph and analysing their
results.
