Clear objectives ease planning which paves the path towards effective instructional accomplishment. It is also evident that instruction can be more clearly delivered when the teacher knows where s/he is heading and the main stations s/he is stopping at. Accordingly, having clear and  straightforward instructional objectives makes it clear to both the teacher and his / her students about what, when, and how they will learn. That's why instructional objectives had a very heavy weight in the teaching and learning processes. 

"Instruction that doesn't change anyone has no effect, no power. if it changes students in undesired directions, it isn't called effective; instead it is called poor, undesirable, or even harmful instruction. Instruction is successful, or effective, to the degree that it accomplishes what it sets out to accomplish." Robert F. Mager (1997)

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