The method most used is the Hamburger, Compliement, critisim, compliement, but it is important to remember the "Losada Ratio", this consistently proves more effective, as you need three positives to ever negative if you don't want to affect the productivity.
The correct mix for maintaining productivity is three positive comments for each negative comment. This formula, known as the "Losada ratio," was named afterDr. Marcial Losada, who studied the interplay of positive interactions and economic well-being. According to researchers, the Losada ratio of three positives for every negative feedback appears to be the minimum necessary to achieve high performance.