Observation vs. Inference• An observation is

actually what we perceive using our senses - touch, smell, sound, sight – in chemistry, we never use taste.

Observation vs. Inference• A perception is

information from our senses.

• Be CAREFUL – Our brain can play tricks on us!

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Observation vs. Inference• Inferences are conclusions that we

make based upon our observations and personal perceptions.

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.

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)

How to be a good lab practitioners

2. Turn off your personal bias (filters).– Everything that

you observe may be important –

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

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.