The PCI Software Security Framework is separate and independent from PA-DSS. While the PCI Software Security Framework includes elements of PA-DSS, the Framework represents a new approach for securely designing and developing both existing and future payment software.
PA-DSS was designed specifically for payment applications used in a PCI DSS environment. The PCI Software Security Framework is designed to support a broader array of payment software types, technologies, and development methodologies in use today and also support future technologies and use cases.