1. Observation vs. Inference An observation is actually what we perceive using our senses - touch, smell, sound, sight – in chemistry, we never use taste.

2. Observation vs. Inference A perception is information from our senses. Be CAREFUL – Our brain can play tricks on us!

3. READYREADY

4. Observation vs. Inference Inferences are conclusions that we make based upon our observations and personal perceptions.

5. Why is this important? If we want to be a good lab practitioners, we must be able to separate observation from inference (fact from fiction) A good lab practitioners has seen something and can accurately communicate the information as facts.

6. How to be a good lab practitioners 1.Pay attention to details –Systematically observe the entire event from one end to the other –Look at EVERYTHING! (This is not easy)

7. How to be a good lab practitioners 2. Turn off your personal bias (filters). –Everything that you observe may be important –

8. How to be a good lab practitioners 3. Don’t jump to conclusions. –Your personal knowledge and experience may lead you to the wrong conclusion. –The more information you have, the better your conclusions will be later

9. How to be a Good Witness 4. Write everything down. –Our memories are faulty. –Evidence allows other to see the same facts and interpret them in different ways.