Server SAS - It is an enterprisewide version of SAS software. It is installed on multiple machines (two or more) based on customer requirements. It can be used by multiple users at the same time. It requires higher hardware configuration than PC It contains four tiers - Web Tier (mainly presentation layer), middle tier(where java applications execute), server tier and data tier (enterprise data sources). It is highly customizable in terms of number of add-on components required by customer based on their requirements.