Instructional Strategies -- The KWL Strategy

The KWL method of engaging students is a very well known strategy. Wait a minute. Is it? I remember a teacher suggesting that I use a KWL chart in my lessons (back when I first started teaching). She said it in a way that suggested I was fully aware of what a KWL chart was and how it would enhance the learning experience for my students. So outwardly, I nodded my head with understanding while inwardly wondering how putting the letters K - W and L on a chart would do anything positive for my students. Eventually, I learned about the importance of activating prior knowledge and the KWL strategy can play a key role in that process. Do you use KWL charts when you teach?