Assessment as Learning is a lot more than just assessment that happens as the students are learning. Assessment as Learning is about helping and training students to develop their capacity to self-monitor, self assess, and decide on their own next steps. Assessment as Learning is about getting students to take control of their learning.
The Ministry Webcast Rethinking Classroom Assessment with Purpose in Mind does and fantastic job of detailing the differences between Assessment as Learning and Assessment for Learning.
Another place to visit to better understand Assessment as Learning is the following eModule on Edugains:
eModule: Assessment for and as Learning
How can I implement Assessment as Learning in my classroom?
The follow are just a few example of strategies for Assessment as Learning. Many of the strategies are interchangeable and can be used in Assessment for and of learning as well.
Learning logs
Self Assessment Checklist
Reading Continuum: