L.A. King and C.M. Burton in an article entitled, The Hazards of Goal Pursuit, for the American Psychological Association, argue that goals should be used only in the narrowest of circumstances: “The optimally striving individual ought to endeavor to achieve and approach goals that only slightly implicate the self; that are only moderately important, fairly easy, and moderately abstract; that do not conflict with each other, and that concern the accomplishment of something other than financial gain.”
Why goal setting doesn't work | Psychology Today