Throw-away prototyping 
Objective: 
-  The principal objective of this model is to validate or to derive the system requirements. 
 
-  It is developed to reduce requirement risks. 
 
Advantages 
-  Requirement risks are very less. 
 
Problems 
-  It can be undocumented. 
 
-  Changes made during the software development proceed may degrade the system 
 
structure. 
• Sometimes organizational quality standard may not be strictly applied.