One of the best ways to ensure benefits are realized from an effort is to embed the post implementation adjustment activities into the effort itself. By acknowledging the need for and scheduling post-implementation analysis of an effort, the formal opportunity to adjust for improved benefit is created.
What often happens after the implementation of a change is that organizational performance or effectiveness goes down after the rollout. This is a quite common reality but rarely anticipated. What naturally occurs is a decrease in productivity for example based on the need for individuals and the organization to adjust. Unfortunately, this is often mistaken as the result of a failed effort. In some cases, the changes are undone in order to restore the environment to a 'better' operating state. The reality is this effect simply needs to be better anticipated, communicated, and baked into the plan itself.
It's also highly unlikely the initial implementation or changes are perfect, yet so many efforts and plans simply assume that they will be, and thus conclude with the roll-out and logistical transition activities. To increase the actual benefits, the best projects or efforts go beyond 'go live' or traditional completion steps and include post-implementation analysis and refinement. This often missing step is where, in many cases, virtually all of the value of an effort will stem from.
By embedding the additional steps of collecting and analyzing performance information and making adjustments, otherwise fruitless efforts are often transformed into successful ones.