Ilimiy is tiykarlari

Closed questions are useful for eliciting factual information and

Open-ended questions are useful for seeking

• 
  opinions
  
• 
  attitudes and
  
• 
  perceptions
  

The choice of the closed questions and the open-ended questions should be made according to

• 
  the purpose for which a piece of information is to be used
  
• 
  the type of study population from which information is going to be obtained
  
• 
  the proposed format for communicating the findings and
  
• 
  the socioeconomic background of the readership
  

Formulating effective questions

In order to formulate effective questions we should:

• 
  Always use simple and everyday language.
  
• 
  Do not use ambiguous questions.
  
• 
  Do not ask double-barreled questions – a question within a question. For example:
  

How often and how much time do you spend on each visit?

• 
  Do not ask leading questions –
  
  •