Certainly. It's a very good question. Pension terms can tend to be a little confusing, and every jurisdiction tends to call things something slightly different.
Defined contribution plans, simply put, are like group RRSPs, except that they're registered pension plans. Employees and employers both put money into the plan, and at retirement you get your lump sum, which is contributions plus investment income, and that's what you have. You manage that lump sum for your retirement.
Defined benefit plans are similar to the public service plan. Employers and employees put their contributions in, and at the end, when you hit retirement, instead there is a formula that calculates, based on the text of the plan, that this is the amount you're going to receive monthly for the rest of your life.
Negotiated contribution plans are a type of defined benefit plan. What's unique about them is that contributions are set out by an agreement. With the everyday defined benefit plan, if there's a plan deficit—that is, there's not enough money in the plan to pay out all the benefits—then the employer puts more money in. With negotiated contribution plans, as the name describes, the contributions are negotiated. They're fixed, so no more money goes into the plan. In order to meet funding requirements set out in legislation, these plans typically would adjust their benefits so that benefits could be reduced in order to meet a plan deficit.