There are many decisions making techniques: most of the them are based on the decision making process. They teach you how to split, to partitionate, to analyze, to weight, to make bifurcation or things like that.
Few of them are not dealing with the most important ingredient of decision making that’s also one of the most widely diffused illness of our management: (lack of) attitude.
Making decisions is like any of our physical and intellectual skills (mind and body are the same stuff, right?): if you want to be good at it, if have to do it and then do it and then do it and then ….
So the best decision making technique is not a technique but a mantra you will repeat day after day, hour after hour starting from now: "decide early, decide small!", "decide early, decide small!", "decide early, decide small!" …