Understanding the Scientific Method: Principles and Critiques

1. Introduction

• The scientific method is recognized as the most effective approach for understanding and predicting the behavior of the natural world.
• Scientific inventions have been used to both improve and destroy human life.
• Successful manipulations of the natural world are defined as technology.
• The scientific method represents a significant advancement over previous ways of acquiring knowledge, moving from "truth by authority" to detailed, empirical observations.

2. The Simple View of the Scientific Method (SVSM)

Scientists make observations that aim to be as objective, unbiased, and unprejudiced as possible. They then create a theory to explain the pattern of results.

• Theory: A combination of observations and predictions about future events. If future predictions fail, the theory is revised.
• Process: Observation > Theory > Generalization (with predictive ability).
• If a generalization is robust, it is considered a law of nature.
• The method produces objective results that allow anyone to repeat the tests.

Criticisms of the SVSM

A. The Myth of "Unbiased Observations"

• Knowledge and expectations influence perception; we often fail to see what we do not know.
• We "see with the brain." Visual experiences cannot be separated from our existing beliefs.
• Our "mental set"—comprising knowledge, expectations, and cultural upbringing—shapes our perception.
• The relationship between knowledge and sight is complex; background knowledge does not always dictate perception.

B. Observation Statements

• Observation statements are expressed through language, which inherently contains theoretical assumptions.
• Observations are "theory-laden"; they classify experience in specific ways, though other classifications are possible.
• The vocabulary used to describe phenomena presupposes a theory about the nature of the object being observed.

C. Selection of Data

• It is physically impossible to record every measure of every phenomenon.
• Scientists must choose which aspects of a situation to focus on, a process involving theory-related decisions based on prior knowledge.

3. Inferences

A. Introduction

Inferences involve moving from particular cases to general statements, which can be either complete or partial.

B. Deduction

Deduction moves from general statements to particular cases to reach a conclusion. Deductive arguments are truth-preserving: if the premises are true, the conclusions must necessarily be true.