Describe evaluation in terms of Internal and External Validity. Explain the threats/limitations of Internal and External Validity. Provide an example of each of the threats/limitations of Internal and External Validity.

Posting should be between 400 – 600 words in length and answer all of the questions provided, as well as, express the opinions and thoughts of the student. Points will be deducted for each unanswered question. A minimum of four references are required for each posting, two of which may be the course textbooks.

References and in-text citations are to be completed in APA format.

This the text book chapter 10

Dignan, M. B. Measurement and Evaluation of Health Education, 3rd edition. Springfield, IL: Charles C. Thomas. ISBN-13: 978-0398059583