(CBS News) One of the mysteries of the problems with the Obamacare website is why Secretary of Health and Human Services Kathleen Sebelius would give the “all clear” after the system failed, repeatedly, during tests days before its debut.

CBS News has learned the website failed with a small test pool of 200 to 300 people that included employees from the government and insurance companies. The government employees worked at their own computers and desks within the Centers for Medicare and Medicaid Services, which oversaw the health care implementation.

According to sources familiar with the process, CMS employees were provided fake personal information to enter into HealthCare.gov rather than their own data and were given a date that testing would begin. However, on that date, the employees were told it was being postponed.

When the testing finally took place in late September, the testers started trying to create an application. Just a couple of pages into the process, everything “ground to a stop,” said one source.

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