and discovery process. SRMs help unclog temporary storage systems, by providing lifetime management of accessed files. This capability is crucial to efficient usage of storage under cost constraints. SRMs also serve as gateways to secure data access. By limiting external access to all storage systems through a standard SRM interface, one can assure not only authenticated access, but also the enforcement of authorized access to files. The SRM technology was highly successful in SciDAC-1 and is currently used in production in several large collaborations. SRM implementations that interoperate have been developed at LBNL, FNAL, and TJNAF, as well as several sites in Europe. Furthermore, this technology increases the scientist’s productivity by eliminating the tedious and time-consuming tasks of managing storage, performing robust data movement, and dealing with security requirements at various storage sites. In addition to leading the SRM standard development by coordinating with multiple institutions, the LBNL team has developed SRM systems to disk storage and mass storage systems, including HPSS. These SRMs have been used in several application domains, including multiple projects at the SDM center, Earth System Grid, the STAR experiment, and the Open Science Grid (OSG). As data sets continue to grow and become ever more complex, these projects depend on the continued development and support of the SRM implementations from LBNL. It is essential to capitalize on the SciDAC-1 successes and sustain current projects that depend on the SRM technology, further improving and deploying SRMs in additional projects and application domains, and continued evolution of the SRM standard. Specifically, based on past experience, we have identified important features that require further development and coordination. These include sophisticated aspects of resource monitoring that can be used for performance estimation, authorization enforcement, and accounting tracking and reporting to enforce quota usage in SRMs. Another aspect that needs further development is SRMs for multi-component storage systems. Such systems, made of a combination of multiple disk arrays, parallel file systems, and archival storage are becoming more prevalent as the volume of data that needs to be managed grows exponentially with petascale computing. Use of SRMs in real applications The SRM interfaces have been cooperatively defined and multiple implementations developed in the US and Europe. LBNL has introduced the concepts and subsequently led a coordinated effort of defining a community-based common interface. Several implementations have been deployed in various applications including HEP, HENP, ESG as well as new application domains,