The objectives of the study were: (1) To study the level of attitude towards work of secondary school teachers. (2) To study the factors affecting the level of attitude towards work of secondary school teachers, that is, sex, age, experience, work, type of schools, size of schools and level of education. (3) To study the level of need for achievement of secondary school teachers. (4) To study the factors affecting the levels of need for achievement of secondary school teachers, that is, sex, age, experience, work, type of schools, size of schools and level of education. (5) To study the relationship between attitude towards work of secondary school teachers, need for achievement of secondary school teachers and the effectiveness of secondary school.

The hypothesis of the study were: (1) Level of attitude towards work of secondary school teachers is in medium level. (2) There is no significant difference between mean scores on attitude towards work of secondary school teachers belonging to different groups of sex. (3) There is no significant difference between mean scores on attitude towards work of secondary school teachers belonging to different groups of age. (4) There is no significant difference between mean scores on attitude towards work of secondary school teachers belonging of level of experiences of work. (5) There is no significant difference between mean scores on attitude towards work of secondary school teachers belonging of different types of schools. (6) There is no significant difference between mean scores on attitude towards work of secondary school teachers belonging of level of size of schools. (7) There is no significant difference between mean scores on attitude towards work of secondary school teachers belonging of different levels of education of secondary school teachers. (8) The level for need for achievement secondary school teachers is in medium level. (9) There is no significant difference between mean scores on need for achievement of secondary school teachers belonging to different group of sex. (10) There is no significant difference between mean scores on need for achievement of secondary school teachers belonging to different group of age. (11) There is no significant difference between mean scores on need for achievement of secondary school teachers belonging to different groups of experience of work. (12) There is no significant difference between mean scores on need for achievement of secondary school teachers belonging to different types of schools. (13) There is no significant difference between mean scores on need for achievement of secondary school teachers belonging to different size of schools. (14) There is no significant difference between mean scores on need for achievement of secondary school teachers belonging to different levels of education of secondary school teachers. (15) There is no significant relationship between need for achievement of teachers and the effectiveness of schools. (16) There is no significant relationship between need for attitude towards work of teachers and the effectiveness of schools. (17) There is no significant relationship between need for attitude towards work of teachers, need for achievement of teachers and the effectiveness of secondary schools.

Sample consisted of 960 teachers from 96 randomly selected schools of Pitsanulok, Khampangpet, Tak, Nakornsawan, Phichit, Petchaboon, Sukhothai, and Utaradit educational regions of Thailand. Multi stratified random sampling method was used.

Tools used for collecting the data were Achievement Value Inventory by Prayag Mehta, TAT by Mcclelland, and AtKinson et al., A check list of enquiring the biodata of secondary school teachers, the Scale to measure school effectiveness constructed and standardized by the investigator. The test-retest and split-half reliability coefficients of the scale were 0.88 and 0.91 respectively.

The data were analyzed with the help of t-test, ANOVA, correlation, and studentised Range Statistical Test (q).

The findings of the study were: (1) The attitude towards work of secondary school teachers was in a high level which rejects the null hypotheses. (2) The attitude towards work of secondary school teachers belonging to male and female groups was in high level. The mean scores of achievement of work of secondary school teachers belonging to male and female groups was in medium level. The recognition of secondary school teachers belonging to male and female groups was in high level. (3) The attitude towards work of secondary school teachers belonging to different groups of age was in high and medium levels. (4) The attitude towards work of secondary school teachers belonging to different groups of experience of work was in high and medium levels. (5) The attitude towards work of secondary school teachers belonging to different groups of levels of education i.e. higher than bachelor, bachelor, and lower than bachelor degree were 9.56, 3.50 and 3.22 respectively. (6) The attitude towards work of secondary school teachers belonging to different groups of size of schools i.e. small, medium, and large were 3.63, 3.60 and 3.55 respectively. (7) The attitude towards work of secondary school teachers belonging to different groups of types of schools i.e. government and private schools were 3.58 and 3.57 respectively. (8) The mean achievement scores of achievement of work of secondary school teachers belonging to different groups of age were in medium level. (9)  The mean achievement scores of achievement of work of secondary school teachers belonging to different groups of experience of work were in medium level. (10) The mean achievement scores of achievement of work of secondary school teachers belonging to different group of levels of education were in medium level. (11) The mean achievement scores of achievement of work of secondary school teachers belonging to different group of size of schools were in medium level. (12) The mean achievement scores of achievement of work of secondary school teachers belonging to different group of types of schools were in medium level. (13) The mean scores of attitude towards work (achievement of work, characteristics of work, and advancement in portion) of secondary school teachers belonging to different sex groups were significant, while of secondary school teachers belonging to different sex groups were not significant (recognition and responsibility). (14) The mean scores of attitude towards work (achievement, characteristics of work and responsibility) of secondary school teachers belonging to different types of school group were significant, while of secondary school teachers belonging to different sex groups were significant while (recognition and advancement of position) were not significantly different for different types of school group. (15) The mean scores of attitude towards work (achievement of work, recognition, characteristics of work and responsibility) of secondary school teachers belonging to different age group were significant, while of secondary school teachers belonging to different sex group (advancement in position) were not significant. (16) The mean scores of attitude towards work in total score and in different components of secondary level school teachers belonging to different groups of experience of work were significantly different. (17) The mean scores of attitude towards work (achievement of work) of secondary school teachers belonging to different groups of levels of education was not significant, while mean score of attitude towards remaining components were significant. (18) The mean scores of attitude towards work (achievement of work, characteristics of work and advancement in position) of secondary school teachers belonging to different groups of size of schools were significant while on other component the differences were not significant. (19) There was no significant difference between mean scores of need for achievement of secondary school teachers belonging to different groups of sex and type of schools whereas there was a significant difference between mean scores of need for achievement of secondary school teachers belonging to different groups of age, experience of work, levels of education and size of school.