operation, process, function, subprogram, subroutine, routine, preprocedure, method, protocol, technique, more...

disorder, chaos, randomness, spontaneity, improvisation

surgery, laser surgery, electrolysis, liposuction, botox, chemical peel, microdermabrasion, more...

same, surgical, standard, simple, general, usual, following, experimental, similar, whole, operative

this process,   process or act,   the process of,   set of steps,   such a process,   long process,   though process,   process of,   ongoing process,   steps to take