While talking about his hopes for the PlayStation Vita Sony marketing VP John Koller has admitted that the original PSP had its own problems when it came to content.
"The issue that happened with PSP is we got overrun with ports," he told Gamasutra.
"It became very difficult for us to define what made PSP unique. The content development became a bit unstructured or decentralised, in that we got a lot of content that was on PlayStation 2 and got thrown over to the handheld."
He said Sony was committed to "console-like games on portables" and guiding developers to that end.
"Follow what Ubisoft is doing with Assassin's Creed. Follow what Activision is doing with Call of Duty," he said, as he explained what Sony told publishers developing for Vita.
"The messaging is similar [between PSP and PS Vita], but I think the output is going to be quite different."
When planning the Vita launch Koller called it "the largest platform launch in terms of marketing investment we've ever had."