Short short short
Keep your questions short, but keep your questionaires short too. When crafting your survey, make a mental distinction between what is essential to know, what would be useful to know and what would be redundant. Ask all essential questions, perhaps a few other useful questions to add value to your study, and forgo [...]

The steps in Designing a Survey

Establish the Goals - What is the intent?
Decide on the Segment - Who the survey will target
Choose an Interview Methodology - Ways to conduct the survey
Craft the Questions - What and how to ask
Conduct the Survey - Ask the questions
Data Analysis - Comprehend the results