A simplified guide for conducting pre-testing and evaluation of educational material by field-workers. 

 - Bangkok :  United Nations (UN) ,  1974 
 - 25p. :  ill. ;   27 cm.  
 - Asian population studies series, no. 27 (INSERT) .
<br/><br/>Includes bibliographical references. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Teaching --Aids and devices--Evaluation --Congresses
<br/><br/><label>Gov. Doc. Class. No.: </label>UN ESCAP APSS-27