The document is a technical competency dictionary for the IT community that provides definitions, knowledge requirements, and proficiency scales for various IT competencies. The introduction explains that competencies are observable abilities, skills, knowledge, or traits defined in terms of behaviors needed for successful job performance. It notes that the dictionary identifies technical competencies required for various IT jobs/roles. It describes how the competencies are structured with definitions, knowledge requirements, and 5-level proficiency scales describing behaviors for each level. The first competency described in detail is Application Development/Support and Maintenance.