Describe the type of program/project end product the Samples are for (I.E. Automotive, Computer, Hawk Missle).
Prototype - no reliability testing is required. Parts are usually for functional testing such as physical deminsions, board insertion, qualification, bread board, prototype, physical samples, new design ect.
Qualification - special electrical or reliability testing may be required (in addition to the testing called for by the sample C-specs).
Replacement - a technology upgrade or competitor substitution.