At a glance, effectiveness and efficiency in teaching is quite confusing but upon analyzing, you will find out that these two qualities are related and both are important in teaching.
When can you say a teacher is efficient? Well, a teacher can exhibit efficiency in the manner she gets things done, how she manages her class and her time in getting things done. A good example wherein a teacher can be called efficient is when she always comes to her class (and leave) on time, with well-prepared lesson plan, instructional materials, engaged time on task, and everything is organized regardless of output or result produced in the teaching-learning process.
How about an effective teacher? Basically, a teacher is effective when she gives her best in teaching and able to make her students learn or master the skills and turned them meaningful, relevant and applicable in real life situations. She is a teacher who reaches out to her pupils and can make a difference in their lives.
Generally, efficiency and effectiveness in teaching are two different things. Efficiency means doing things right while effectiveness is doing the right things (Peter Drucker). Anyway whatever definition we gather, these two concepts should complement each other because it’s hard to be an effective teacher if you are not efficient. Likewise, if you are an effective teacher, most likely you are efficient. But it doesn’t necessarily mean that if you are efficient, you are effective but you have the chance to be one. Always remember that your students don’t care what you know (efficiency) until they know that you care (effectiveness).