The aim of our study was to determine the effect of training of phonol
ogical abilities upon the acquisition of reading and writing during th
e first year of primary school. An experimental design, with five grou
ps of subjects matched by age, sex, IQ, phonological abilities and rea
ding and writing level was used. Every group received twenty training
sessions, over a period of six months. Four groups had different train
ing procedures depending upon the type of task used (phoneme versus co
ncept discrimination) and the way that the task was carried out (using
or not using manipulative materials). The fifth group served as contr
ol. Post training measures were taken in reading, writing, and mathema
tics, besides the teacher's estimated scores, twice: immediately after
the end of training sessions and two months later. Significant effect
s on both reading and writing measures were obtained for the groups tr
ained on phonological activities using manipulative materials. The eff
ects were reliable for the two tests. The theoretical implications of
the results are discussed and their implications for educational pract
ice are indicated.