and when to use the resources to effectively implement the project activities

and when to use the resources to effectively implement the project activities (must be combined with cost estimation)
Input Tools and TechniquesOutput Corporate Environmental FactorsOrganisation's Process AssetsActivity InventoryActivity Inventory AttributesResource AvailabilityExpert Judgment MethodReplacement OptionsIdentify publicly available estimating dataProject Management SoftwareBottom-up Estimating Activity Resource RequirementsUpdated Activity AttributesResource Breakdown StructureUpdated Resource Calendar Change Requests