This document discusses various career information classification systems that provide resources to help career counselors and clients systematically explore occupational information. It describes classification systems like the Dictionary of Occupational Titles, Guide for Occupational Exploration, Standard Industrial Classification, Standard Occupational Classification, Occupational Outlook Handbook, Occupational Information Network, and Roe's Classification System. Each system organizes and groups occupations differently based on factors like the work performed, skills required, industries, and level of responsibility. The classification systems aim to help counselors and clients explore career options and make more informed decisions.