Both.
There is a "teaser" background section giving you a short overview of central europe of 2013.
But the rules system is the complete Stage I rules. The Reflex system is broken down into three stages to fit different playing styles. Each stage builds on the previous one and the rules for each are completely interchangeable. Stage I rules are a very rules lit system. Stage II is the default style of play and is comparable in depth and difficulty to other systems. Stage III is a detailed rules system, including rules enhanced rules for things such as caloric intake, physical build, etc.
There are no extensive number crunching at this stage. But these rules form the basis for Stage II and Stage III. So if you started here you don't have to relearn a new system just add the Stage II and III rules you like as you progress.
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Keith Taylor
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