Infinitives to avoid include to know, to understand, to enjoy, and to believe. Action verbs are observable and better communicate the intent of what is to be attempted. They include to write, to apply, to recite, to revise, to contrast, to install, to select, to assemble, to compare, to investigate, and to develop. An objective must be attainable with the resources that are available. It must be realistic.
Many objectives are realistic.
Yet, the time it takes to achieve them may be unrealistic. For example, it is realistic to want to lose ten pounds. However, it is unrealistic to want to lose ten pounds in one week. The objective should be central to the goals of the organization. The successful completion of the objective should make a difference.