00636nam a2200205Ia 450000100060000000300050000600500170001100800410002801000150006902000150008405000170009908200100011610000230012624500610014926000720021030000290028249000500031150400270036165000420038839842BIBL20160527200210.0771118s1978    njua     b    00010 eng    a 77025132   a08777811090 aLB1027b.A42  a371.310aAlden, Jay.2Local10aBackward chainingbteaching task performancecJay Alden.0 aEnglewood Cliffs, N.J.bEducational Technology Publicationscc1978.  axii, 69 p.bill.c24 cm. 4aThe Instructional design libraryvv. 62Local  aBibliography: p.67-69. 0aActivity programs in education2Local