Discussing how the CBS drama will change, Greg Plageman told TVLine that "you never want to feel like you totally nailed it".
"You want to keep changing and evolving the show," he said. "There's always the danger of falling into a rut and feeling formulaic, and we've tried to shy away from that. What we have found is a nice chemistry between our characters that works, but we always reserve the right to surprise the viewers with a twist or a killing."
Fellow exec Jonathan Nolan also revealed that he and the show's writers strive for a balance between self-contained episodes and longer story arcs, suggesting that such a format was "perfected with The X-Files".
"You can tune in and get a satisfying story with a beginning, middle and an end, but also another larger piece of the puzzle for fans watching every week," he explained. "So, we're setting up kind of a rogues' gallery of villains and setting them loose."
> Person of Interest star Michael Emerson: 'US public love vigilantes'
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Person of Interest star Taraji P Henson recently told Digital Spy that she is looking forward to exploring her character Detective Carter across multiple seasons.
"All the backstories are still being created and developed, so you have to trust the writers," she said. "And I trust these writers so much, because they're so good, they never stop amazing me."
Person of Interest season two begins tonight (September 27) at 9/8c in the US. The series airs on Channel 5 in the UK.
Watch a promo for the new season of Person of Interest below: