This document discusses various methods used to study bone growth, including both measurement and experimental approaches. Measurement approaches involve directly measuring bones and skulls without manipulation, using techniques like craniometry, anthropometry, and radiography/imaging. Experimental approaches analyze bone growth by inducing changes and making observations, such as using fluorescent labels, microelectrodes, or metallic implants in animals. Both approaches involve collecting data through methods like cross-sectional or longitudinal studies, analyzing the data, and presenting it using tables, graphs or diagrams.