A final “pre-flight checklist” before the Web site’s Oct. 1 opening, compiled a week before by CMS, shows that 41 of 91 separate functions that CGI was responsible for finishing by the launch were still not working.

And a spreadsheet produced by CGI, dated the day of the launch, shows that the company acknowledged about 30 defects on features scheduled to have been working already, including five that it classified as “critical.” For instance, one critical defect was that people who had finished creating applications — an early step in enrolling — got incorrect messages that their applications were incomplete if they tried to sign back in.

All told, of the 45 items in which CGI had expressed high confidence at the late August meeting in Baltimore, most were still not ready by the time consumers were supposed to be able to start to buy health plans online through the federal marketplace, according to a government official familiar with the project who spoke on the condition of anonymity to discuss private information.