Things that make a good questionnaire measuring behavior

Chapter 5 discusses Measurement and introduces you to two of the most fundamental concepts you need to understand in this course: Reliability and Validity.
How are Reliability and Validity related?
If a measure (e.g., a test on some attribute) is reliable, does that mean it is also valid? Explain.
On the other hand, if a measure is valid, does it mean that the measure is also reliable? Explain.
Chapter 6 discusses methods of measuring Behavior, something we see quite often in the Social Sciences.
What are some things that make a good questionnaire measuring behavior?
Why is it important to be unobtrusive when observing behavior for research purposes?

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