SFIA and SFIAplus are frameworks for defining IT skills and competencies. SFIA provides a high-level 2D framework while SFIAplus provides more detailed 3D models including additional skills, tasks, and training resources. The document discusses how organizations in both the public and private sectors in the UK have used SFIA/SFIAplus for skills management, career development, and ensuring IT professional standards. Tools like the IT Job Describer, Skills Manager, and Career Developer leverage SFIAplus to help with tasks like creating job descriptions and developing skills.