I call it bracketing. I've done it for decades and consider it normal practice in conditions that are marginal, doubtful or less than appealing. Others may call it learn-by-rote: nailing the image through relentless repetition. The key to getting the best shot is to edit ruthlessly, being your own cruel judge and executioner. On my lightbox at the moment I have a series of 6 images, brackets +/- 0.6 from standard metering, and cannot settle on just one for printing/matting and framing. Ultimately, it will be a blind selection, the others mothballed, only to be brought out years forward, with me thinking in hindsight, "this would have been better!" In essence, scenes should be photographed as much as possible and select the best scene.