He told the committee: "They wrote off software that was working and they wrote off infrastructure that was working. They were written off because the business decided not to use them."
MPs also asked Caroline Thomson, the BBC's former chief operating officer, about her pay-off, which saw her leave the corporation with around £700,000 and a £2 million pension pot.
Asked if she would return some of that money, she said: "No."
She told the committee: "I was made redundant, I was made redundant, I didn't want to be made redundant. I wanted to stay and work.
"I was paid a lot of money, I completely accept that, but it was my contractual entitlement and no more."
Asked to justify her pay, Ms Thomson said: "I did a very big responsible job, I could have earned a lot more if I was working for ITV."
Defending what he said about DMI in February 2011, Mr Thompson said: "I'm absolutely clear that at the time that was what I knew about the project."
Mr Thompson said he believed that "overall a lot of work and effort went in to get it to work on the business side".
However, he said that the "language which the team were using" combined with reports the technology was being used on shows such as The One Show, led him to believe DMI was "being more extensively used" than it was.
Former BBC Trustee Anthony Fry said a decision to scrap a planned internal audit of DMI was "probably the wrong decision".
He also said the Trust "did not have a sufficient knowledge around technology" to measure its progress, but said changing the BBC's governance system or bringing in the communications watchdog, Ofcom, would not have changed the outcome.
A BBC spokesman said: “BBC Director of Operations Dominic Coles said in his evidence to the committee that after an extensive review, we didn’t find anything that had enduring value and we decided from a prudent accounting perspective to write everything down to zero.”