7 .0 COMPARISON OF CONCEPTS ............................................................................................85 7.1 Approach.......................................................................................................................85 7.2 Configuration and Mass Comparison ....................................................................... 85 7.3 Environmental Impact................................................................................................. 86 7.4 Overview.......................................................................................................................88 8 .0 SPS DEVELOPMENT............................................................................................................. 89 8.1 Developmental Goals ................................................................................................. 89 8.2 Recommended Development Program....................................................................... 89 8.3 Expanded Analysis and Ground Experiments (Part I)..............................................89 8.4 Shuttle Based Demonstrations (Part II) ................................................................... 89 8.5 Precursor System Development and Demonstration (Part III)..................................90 8.6 Operational System Development and Demonstration (Part IV)............................90
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