Identification of operating conditions that have been beneficial or injurious to overall performance of past waterfloods in heavy oil reservoirs is the first essential step towards optimization of similar projects in the future. Comparative analyses of performance of various waterfloods in a given region (deposited under similar conditions) can be very instructive to identify such conditions. Insights on performance of, waterfloods in heavy oil reservoirs were derived from a comparative evaluation. of recent performance history of three selected waterfloods. These waterfloods, involved increasing, decreasing and steady water injection rates. It was seen that aggressive injection rates lead to increased, oil rates, but at rapidly increasing water cuts. Decreasing water injection rates, on the other hand, lead to low oil rates, but with water cuts increasing relatively more gradually. There is, therefore, an economically optimal water injection rate strategy for each specific situation.