This book explores constraints affecting curriculum implementation in adult basic education and training (ABET). The book determines perceptual constraints of adult learners on the implementation of adult basic education; establishes perceptual constraints of education managers on their understanding of their role in adult education; explores methodological constraints of teaching adult basic education in the implementation of the adult basic education and also identifies problems facing adult education officers in monitoring and supervision of adult education programs. The author recognizes poor program design and implementation as lead causes of inefficiency in basic adult education not only in Kenya but also around the world. The book show how Adult education is bedeviled by inadequate teaching staff, funds, facilities; and unskilled part-time teachers among others. This raises a lot of concern since these challenges pose a direct threat to Curriculum implementation in many Countries.