Skill-oriented task sequencing in an intelligent tutor for basic algebra /cDavid McArthur ... [et al.] ; prepared for the National Science Foundation 

 - California :  Rand Corporation,  1989 
 - 27 p. :  ill. ;  28 cm 
 - A Rand note ;  N-2966-NSF .
 - Rand note ;  N-2966-NSF .
<br/><br/><label>ISBN: </label> Hadiah