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The methods listed may or may not be applicable to the Request-URI ; the Allow header field ( section 14.7 ) MAY be used to indicate methods allowed for a particular URI . Since any new reflective inherits the fields of its parent , and since the definitions of the methods specialized to the new reflective are intended to supersede those of the parent , it is sufficient to use only the leaves of the inheritance hierarchy . The methods used may depend on checklists of controls , divide functional requirements into engineering partitions , or create abstract models of both the problem and the solution . The specimen collection , handling , and analysis methods used will differ based on the purposes and needs of the clinical plan , and the methods used may also differ based on the purposes and needs of the parties requesting the testing , be they licensing boards , hospitals , or the treating physicians of recovering health care professionals . The methods employed may be relevant for understanding the general problem of stability of black hole solutions in the absence of symmetry . If the effort proves successful in reducing errors made by taxpayers , the methods used may be expanded to other tax forms . The methods used may include determining the optical properties by use of the petrographic microscope when the aggregate is examined in grain mount , thin section , or both ; various methods of determining the chemicals present ; determining the crystal structure by x-ray diffraction ; and matching x-ray diffraction patterns for positive identification . The methods used may include , but are not limited to computer , Web-based , and conventional face-to-face approaches such as Web conferencing , computer simulations , E-mail list servers , technical assistance , and workshops and other meetings . A resource implements an interface by supporting the methods defined to exist within that interface .