A seasonal calendar allows the practitioner to look at seasonal trends that may affect the use or implementation of a service in a community. Seasonal trends may reveal decreases in the supply of labour, periods of hunger that may affect for example school children's performance at school and so on. Seasonal calendars may reveal important reasons for the gaps between service utilization and intervention outcomes. This will allow the practitioner to plan for other things that may not have been considered as part of the intervention but which will greatly improve the quality of the intervention and make life better for the community members. To use the seasonal calendar as a data collection tool, the practitioner gets community members to write a list of the things that they have to do throughout the year. These things are related to work, cultural activities, certain times of the year in which participants are unavailable at all and so on, and to plot how they share them with other members of the community.