This section describes how we developed our arts and culture performance indices. In total, we have identified 184 performance indices to examine over time. Each index provides insight into the financial, operational, and engagement health of an arts and culture organization. We currently have data to examine 128 indices, and we know what data we need to work towards gathering in order to answer the rest. These performance indices fall into 9 general areas: Contributed Revenue, Earned Revenue, Expenses, Marketing Impact, Bottom Line, Balance Sheet, Community Engagement, Program Activity, and Staffing. This edition includes insights on trends as well as updates on seven of the 128 performance indices key to assessing organizational health, all related to earned revenue, marketing and engagement. We present many as comparative measures (e.g., program revenue per attendee and marketing expenses per attendee). Edition 4 will focus on metrics related to contributed revenue and Edition 5 will examine expenses, staffing bottom line, and capital structure.