This document discusses strategic decision support systems (SDSS) and proposes a combined approach for SDSS design that integrates expert knowledge and historical data. It presents SDSS definitions, taxonomies, components and architectures. It also discusses knowledge acquisition methods and a combined approach that aggregates expert knowledge with a data-driven process to build a corporate memory. This combined approach aims to enhance knowledge reuse, build a company referential, and improve strategic decision making through an integrated SDSS.