when dimensional similitude exists among the effectiveness measures. To 

 avoid this limitation, the more versatile product form of the effectiveness 

 equation is used. 



One of the primary goals of system performance methodology is to 

 prevent decisions made on inadequate or inappropriate data. If used 

 properly, the model discussed earlier will prevent such occurrences. As 

 evidenced by the application of the model to the heavy-lift project, there 

 is a chance of the equations being fairly trivial. While it is felt that the 

 present analysis will adequately serve the needs of the project at this point 

 in time, an extended version may possibly be developed at a later date to 

 incorporate the anticipated experimental data. Future work in this area will 

 be particularly helpful in mission definition and detailed design. 



Selection of the Figures of Merit 



The m figures of merit for each system were determined by assuming 

 that the operational requirements of the 1968 TDP represent the most 

 desirable values for the system parameters; thus, a calculated or estimated 

 value less than the relevant TDP value is tantamount to a decrease in 

 desirability. The following figures of merit and their associated weighting 

 factors were used as guidelines in this study: 



Figure of Merit (e|^) Weight (w|^) 



Dependability 3 



Mobility 1 



Extendability 1 



Covertness 1 



Rate of lift 2 



Oscillation 2 



Load transfer at the surface 3 



Sensitivity to sea state 2 



Sensitivity to water density 2 



Sensitivity to water currents 2 



Placement potential 2 



39 



