John Wooden's Four Steps For Effective Teaching.

Confucius said,

“I hear I forget,

I see I remember,

I do I understand”

Explanation

Demonstration

Imitation

Repetition

Whether you are teaching addition and subtraction, or the quadratic formula, the bones of the skeleton or the eight steps of digestion, a lay-up or the intricacies of the half court trap, to be an effective educator the steps do not change.  The educator must be able to provide the student each of these four levels of the teaching process in order to impart knowledge.

Explanation must include both the basic how, what, when and where, but most importantly the why.  If the learner cannot understand he value of the information or skill, the knowledge will not be passed on to long term memory.  In order to become a useful part of the student's knowledge base, there must be a need to associate it to previous knowledge as well as future need.

Demonstration must be done without a preconceived idea of what the learner knows.  The demonstration should address all aspects of the skill from the most rudimentary step to the ultimate conclusion. Demonstration must include the basic steps from beginning to end. Even the most experienced student should find value in reviewing the  basic components of a process or skill.

Imitation must provide the opportunity to succeed without a fear of failure but an incorporation of failure with correction as a means of understanding.  Students should be provided the opportunity to mirror the instructor throughout the process or skill.  It is through imitation that the student gains an understanding of the concept and a confidence in their own ability to succeed.

Repetition must be enough to develop a comfort level while keeping the information fresh.  Avoid at all costs the drill and kill that is detrimental to the ultimate goal of learning. Repetition should provide insight for both the instructor and the student as to the level of mastery and the need for further instruction and/or practice.  Repetition should serve as the measuring stick as to the next steps in the learning process.

Elephant's Toothpaste

One of the most exciting classes I conduct in my chemistry classroom is the Elephant's Toothpaste demonstration.  While, this is an old standard and some students have seen it on You Tube or in other science classes, it never fails to capture the student's attention and create opportunities for discussion.

I conduct the demo in a 5 L graduate cylinder. I place the cylinder in an equipment tray placed on a tarp to protect the floor from overflow.

Pour 250 mL of 30% Hydrogen Peroxide (H2O2) to the cylinder and add 1-2 tablespoons of dish soap to the peroxide.  Dawn is preferable, but any dish soap will work.  I drip food coloring down the sides of the cylinder to provide the toothpaste striping. I then add 4-6 grams of Potassium Iodide (KI)  to the solution. Step back and enjoy the reaction, both from the cylinder and the students. 

I do not ask students to complete a lab write-up for this demonstration.  I instead use the opportunity to  discuss rates of reaction. I will have students touch the surface of the cylinder with the back of their hand to feel the heat produced by the reaction and discuss endothermic and exothermic reactions.   There are a multitude of topics that can be discussed from this reaction.

However most important is the discussions that start with the students questioning, why does that happen? Will other types of salt do that? What if we used ....?  Why did we add the soap?  That is when the thinking begins and the learning takes over.