Frank gone, Parker still here !!

[Supersub6]

But why do clubs sign managers for more than one season? Parker says he would be the first one to say goodbye if he thought it was the right thing to do.

Would you sign a contract for one season when you are probably going into the job on the back of failure as Scott was after relegation?
You are inheriting players from the previous manager and, in Scott's case, many wanted away and the club needed to sell to maintain financial needs, in spite of getting a pay-off from VK's departure.
Any manager would not sign a one year contract because of the above reasons because he would want to build a team to try to get success. Promotion to the PL in the circumstances last season was a good achievement, however, without spending a lot of money, we were always destined to struggle this season.

Spurs and Forest have had several managers in the past few seasons and sacked them with contractual pay-offs, however, they are both not happy, in spite of their managers having given them European football. As ballcock says, no PL manager resigns, they wait for the push and we can't afford to push.