What are the Causes of Non readers of Grade 1 Pupil?

There is no definite cause for Non readers especially among GRade I pupils. There are good teachers in Grade I who have plenty of non readers. It could be due to their instructional strategy or technique employed. It could also be due to absenteeism of pupils and lack of support instructional materials during instruction.Another could be due to the low level literacy on the part of the parents and many more. . . .