Introduction
Thekeyquestionthatthequestiondefinitionmustansweris"Whatistheproblemtobesolved?".First,collectandanalyzerelevantinformationtoclarifytherequirementsofusers.Thentheuser'srequirementsareaccuratelyandcompletelydescribed,andtheresultisaproblemdescriptionbook.
Thenextworktobedoneisafeasibilitystudy,whichhastoanswer"Canthequestionraisedbytheuserbesolvable?Whatisthevalueofthesolvable?"Theresultisafeasibilityreport.
Thenconductademandanalysis.Afterthefirsttwostepsarecompleted,proceedtothesystemrequirementsanalysiswork,thepurposeistoclarifythesystem"what?".Attheendofthisphase,documentssuchassoftwareplans,requirementsspecifications,etc.shallbegenerated.Forsmallsoftware,thefeasibilitystudycanbeomitted,andthecorrespondingdocumentscanalsobeomitted,buttherequirementsspecificationisindispensable.
Whatisinformation?
Themoderndefinitionofinformation.[2006,MedicalInformation(Journal),DengYu,etc.].
Theinformationis.InverseWienerInformationDefinition
Informationisincreasingcertainty.InverseShannonInformationDefinitionMarksofmatter,energy,informationandtheirattributes
Informationisacollectionofthings,phenomenaandtheirattributes.2002