Monitoring:
When to monitor?

The example in Box 6 shows that data gathered only once cannot generate meaningful conclusions about change. Information must be collected consistently at intervals that make sense for the subject matter. Should the information be collected weekly? Monthly? Yearly? The frequency depends on the objective of monitoring. If the child’s weight is monitored to identify health problems, then monitoring every year will not be enough. On the other hand, monitoring her weight weekly might be too burdensome. The key is finding a balance between having enough observations to be able to identify and react to important trends without making the process too costly or time consuming.

Data must be collected at meaningful times. For instance, the Bolivian census occurs during the dry season in Pando when most families live in the urban municipalities. The regional health authority uses the population information from the census to determine how health resources are to be distributed to the municipalities. However, during the rainy season, the forest municipalities are overburdened by families that migrate to collect Brazil nuts. The municipal health posts struggle to provide services to this influx of people because their resources have been budgeted for the low population levels of the dry season. Furthermore, the rainy season is the peak time for malaria, compounding the strain on health services. In this situation, inaccurate census data distorts the distribution of health resources. Ideally, demographic data should take into account seasonal migrations to provide a more accurate picture.

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