To manage expectations as per the technical level of the events that I host for IT Professionals around Ireland I use the Microsoft's standard level definitions.  To ensure that there is no confusion out there I wanted to clarify what each level means ... So here goes:

Level 100 Description:

Introductory and overview material. Assumes little or no expertise with topic and covers topic concepts, functions, features, and benefits.

Level 200 Description:

Intermediate material. Assumes 100-level knowledge and provides specific details about the topic.

Level 300 Description:

Advanced material. Assumes 200-level knowledge, in-depth understanding of features in a real-world environment, and strong coding skills. Provides a detailed technical overview of a subset of product/technology features, covering architecture, performance, migration, deployment, and development.

Level 400 Description:

Expert material. Assumes a deep level of technical knowledge and experience and a detailed, thorough understanding of topic. Provides expert-to-expert interaction and coverage of specialized topics.