This document discusses key concepts in scientific observation and measurement. It explains that scientific development relies on making quantified observations and measurements using the scientific method. The document outlines several core ideas, including: 1) The scientific method involves making observations, measurements expressed in SI units, collecting data, analyzing results, and refining theories. 2) There are seven base SI units used to measure fundamental physical quantities like mass, length, time, and temperature. 3) Larger and smaller multiples of base units are expressed using prefixes to facilitate scientific communication. 4) Significant figures indicate the precision of a measurement based on the single digit with a multiplier prefix. 5) Order of magnitude approximates the value of