Product Data Management ( PDM ) and Project Lifecyvle Management. PDM is primarily used in small organisations who have just migrated to 3d-cad or are trying to migrate in near future. PLM is used in large organisations spread across the globe to achive process opyimizaion. Where as the main purpose of PDM is design optimisation. While PDM is not very cost effective for small organisations, even large organisations can not afford to implement a PLM system without carrying out a cost-benefit analysis.