# COST 4. How do you decommission resources?
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Implement change control and resource management from project inception to end-of-life. This ensures you shut down or terminates unused resources to reduce waste.

**Topics**
+ [COST04-BP01 Track resources over their lifetime](cost_decomissioning_resources_track.md)
+ [COST04-BP02 Implement a decommissioning process](cost_decomissioning_resources_implement_process.md)
+ [COST04-BP03 Decommission resources](cost_decomissioning_resources_decommission.md)
+ [COST04-BP04 Decommission resources automatically](cost_decomissioning_resources_decomm_automated.md)
+ [COST04-BP05 Enforce data retention policies](cost_decomissioning_resources_data_retention.md)