Re: [New!] My Daily Diary of Validation
> Hi Folks, > > Thanks Rick, Frank, and Alexander for your comments. The distinction > between validation and verification has been illuminating. Wikipedia says > that validation is, "Are you building the right thing?" and verification > is, "Are you building the thing right?" I've recast my diary to consist > of, I think, entirely validations. I still don't think they are mostly validations. Validation is ex ante, verification more ex post. So when you are checking that an incoming document is OK against a schema, you are validating it: the pre-condition. When you check the result of a process is OK against a schema, you are verifying it: the post-condition. So checking the totals against the list, for example, is verification. The water is muddy because in a single-party pipeline the verification of a previous stage may be the validation requirement for the next. Cheers Rick Jelliffe > > ------------------------------------------------- > > I wake up. I walk down stairs and get a can of V-8 juice from the 'frig. > Before I open it I validate that its expiration date is greater than the > date on my calendar. > > > Tonight there's a nice movie on TV. I set the VCR to record the show. I > validate the time and channel against that listed in the TV Guide. > > > I'm short on groceries. I write a list of items I need. I go to the store > and shop. When finished, I validate the items in my shopping cart against > the items on my grocery list. > > > The cashier tells me the total cost for the groceries. I validate the > total against the total I computed on my calculator. > > > Time for work. I start my car. My car's computer validates the sensor > readings (oil level, fuel level, and engine RPM) against the > factory-expected values. > > > As I drive I pass a speed limit sign. I validate that the reading on my > speedometer is less than or equal to that posted on the sign. > > > My GPS tells me to, "Take the next right onto Route 3 south." I validate > the sign at the entrance to confirm it says "Route 3 south." > > > > My GPS tells me to, "Take exit 27." I validate the sign on the exit ramp > to confirm it says "exit 27." > > > I arrive at the subway station. I need cash for the subway train. At the > ATM I validate the amount it dispensed against the amount I entered on its > keypad. > > > Before getting on the subway train I validate that it is the right one by > comparing the train number against the number listed on the directions > that I brought with me. > > > Before getting off the subway train I validate that the stop is the right > one by comparing the name posted at the stop against the name listed on > the directions that I brought with me. > > > I arrive at the office. The guard validates that the picture on my badge > matches my face. > > > I need to FAX a document. I validate the direction of my document against > the direction icon on the FAX machine. After FAX'ing I validate that my > document was sent to the right number by examining the phone number on the > FAX receipt against the phone number on my document. > > > I check my inter-office mail. I received a letter. I validate that the > mail stop number on the letter matches the number on my mail box. > > > I need to send an email message. I validate that the recipient is in my > address book. > > > Time to go home. I need to first pick up a prescription. I validate that > the prescription is correct (it is mine and the medicine is the right > one). > > > Time for bed. I check my calendar for tomorrow's meetings and validate > that the alarm is set at least 3 hours prior to the first meeting. > > ......................................... > > Validation is fundamental. It is not a one-time event - it occurs > continuously. It confirms that my action is consistent with a "standard." > > > /Roger > _______________________________________________________________________ > > XML-DEV is a publicly archived, unmoderated list hosted by OASIS > to support XML implementation and development. To minimize > spam in the archives, you must subscribe before posting. > > [Un]Subscribe/change address: http://www.oasis-open.org/mlmanage/ > Or unsubscribe: firstname.lastname@example.org > subscribe: email@example.com > List archive: http://lists.xml.org/archives/xml-dev/ > List Guidelines: http://www.oasis-open.org/maillists/guidelines.php > >
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