# Document revisions
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| Change | Description | Date | 
| --- |--- |--- |
| [Updated best practice guidance](#document-revisions) | Multiple best practice updates. New best practice COST06-BP04. | June 27, 2024 | 
| [Updated best practice guidance](#document-revisions) | Minor best practice updates throughout. | December 6, 2023 | 
| [Updated best practice guidance](#document-revisions) | Best practices were updated with new guidance across the pillar. | October 3, 2023 | 
| [Updated best practice guidance](#document-revisions) | Best practices were updated with new guidance in the following areas: [Governance](https://docs.aws.amazon.com/wellarchitected/latest/cost-optimization-pillar/governance.html), [Monitor cost and usage](https://docs.aws.amazon.com/wellarchitected/latest/cost-optimization-pillar/monitor-cost-and-usage.html), [Select the best pricing model](https://docs.aws.amazon.com/wellarchitected/latest/cost-optimization-pillar/select-the-best-pricing-model.html), and [Manage demand and supply resources](https://docs.aws.amazon.com/wellarchitected/latest/cost-optimization-pillar/manage-demand-and-supply-resources.html). | July 13, 2023 | 
| [Updates for new Framework](#document-revisions) | Best practices updated with prescriptive guidance and new best practices added. Question COST 11 added with new best practice COST11-BP01. | April 10, 2023 | 
| [Minor update](select-the-best-pricing-model.md) | Missing guidance restored to the pricing model section. | January 13, 2023 | 
| [Whitepaper updated](#document-revisions) | Best practices updated with new implementation guidance. | December 15, 2022 | 
| [Whitepaper updated](#document-revisions) | Best practices expanded and improvement plans added. | October 20, 2022 | 
| [Minor update](welcome.md#introduction) | Added Sustainability Pillar to introduction. | December 2, 2021 | 
| [Minor update](#document-revisions) | Updated links. | April 25, 2021 | 
| [Minor update](#document-revisions) | Updated links. | March 10, 2021 | 
| [Updates for new Framework](#document-revisions) | Updated to incorporate CFM, new services, and integration with the Well-Architected too.  | July 8, 2020 | 
| [Whitepaper updated](#document-revisions) | Updated to reflect changes to AWS and incorporate learnings from reviews with customers.  | July 1, 2018 | 
| [Whitepaper updated](#document-revisions) | Updated to reflect changes to AWS and incorporate learnings from reviews with customers.  | November 1, 2017 | 
| [Initial publication](#document-revisions) | Cost Optimization Pillar - AWS Well-Architected Framework published. | November 1, 2016 |