2.1.3 Stage 3 - Categorizing, merging, and validation

We grouped the filtered lessons into nine main categories, namely, (i) communication, (ii) economy, (iii) environmental health, (iv) international partnership and cooperation, (v) monitoring and data sharing, (vi) perception and behavior, (vii) policy and governance, (viii) research and innovation, and (ix) socio-economic inequalities. Operational definitions of these themes are listed in table (2).

Table 2. Operational definitions of the nine themes used as a base to cluster and group the lessons identified in the current research.