Computer-implemented methods, computing systems and computer program products for centralized product specification management. A specification management application reads or receives an electronic specification family record stored in a data store. The specification family record includes a data structure of connected product specifications defining product attributes applicable to multiple products. The application also reads or receives a separate or independent product specification that defines product attributes that are not in the electronic specification family record. Electronic bills of material (BOMs) are generated for a user of the specification management application by the application aggregating product specifications of the electronic specification family record and at least one electronic independent product specification such that the electronic BOM includes respective product attributes defined by respective connected and unconnected product specifications. Specification changes are propagated to updated or create new BOMs.