ActivEpi Web, is an electronic textbook for teaching epidemiology, available free on-line. This unique instructional tool can be accessed using the link: http://activepi.herokuapp.com.

ActivEpi Web features:

• 15 lessons (chapters), each with several activities.

• Topics covered in most introductory epidemiology texts:

• study designs, measures of frequency and effect, potential impact,validity (selection, information, and confounding biases),interaction/effect modification, analysis of 2x2 tables, control of variables, stratified analysis, matching, introduction to logistic regression.

• A full range of learning activities:

• Narrated instructional expositions that use video and/or animation
• Interactive study questions within expositions
• Interactive short quizzes
• Exercises using computer software to analyze data
• Homework exercises with solutions available to instructors only

• Materials for the Instructor:

• PowerPoint presentation lecture materials
• Homework exercises and exam questions
• Answer files to homework exercises and exam questions available only to instructors