Remember that when writing essays, not only do you need a compelling topic but you also need to follow the accepted formula or outline. To learn what this involves, you could search for essay papers online to see learn about the acceptable formula. Obviously, the grade your teacher offers would be based on the topic for the essays paper chosen, as well as the way in which it was written and the way it was presented. This is why taking time to learn to choose the topic and having a well written essays paper is so important because you would have the confidence needed to give a compelling presentation.
As a second example, consider the variable intrinsic motivation, defined as "The motivation for a behavior that is based on the inherent enjoyment in the behavior itself." A researcher might be tempted to write an item that says, "I work hard in school" to measure intrinsic motivation. However, this item does not directly relate to the construct definition presented earlier. The researcher might argue that if a pupil enjoys going to school, then they will then work harder. However, there is a difference between "working hard" and "enjoying" something. A student might work hard in school because his father will beat him if he performs poorly, but that student might thoroughly hate school. This student would respond "Strongly Agree" to the item, but have low intrinsic motivation in reality. If a participant ticks Strongly Agree, that means they are high on the construct definition, and a participant who ticks Strongly Disagree should be low on the construct definition. Therefore, all items must center around the construct definition - enjoyment in the case of intrinsic motivation. A good item for intrinsic motivation might read: "I enjoy going to school."