Formal work organizations are created to produce goods and services and to pursue dominant goals that individuals acting alone cannot achieve. However, the importance of some factors in the achievement of this objective cannot be overemphasized. This study examines the contribution of work environment, organisational culture, to employees' job performance. Ex-post facto research design was adopted. Proportional stratified and simple random sampling techniques were utilized to select 500 participants from three oil companies in River State, Nigeria (Agip = 150, Schlumberger = 185, Nigerian Agip exploration = 165). Two standardized self-report questionnaires were used for data generation. Two hypotheses were raised and tested using multiple regression and t-test statistics. Findings revealed among others that the two predictor variables (work environment and organisational culture) combined and individually, predicted the criterion variable (job performance). Based on the findings of this study, a number of recommendations were made among which are: employers of labour should provide suitable work environment for increased job performance of employees; and make the organizational culture favourable so as to enhance productivity of the work force.

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Job involvement is a relatively recent construct that could enhance employee performance. Previous research findings have shown strong associations between job involvement and organizational productivity, but very few studies have been conducted to examine the link between job involvement and some human activator variables (perceived organizational justice, organizational support, and group efficacy) among employees in Nigerian organizations. This study therefore employed a correlational design to investigate this link using 200 personnel of the Nigerian police chosen through disproportional stratified sampling. Results suggest that job involvement correlates significantly with the three predictor variables: procedural justice, perceived organizational support, and group efficacy. It was also found out that and the predictor variables accounted for 52.2% of the variance in the job involvement among Nigerian Police Force. It was recommended, among other things, that psychological intervention programmes that could enhance job involvement of Nigerian police personnel be introduced by government.Psychol Stud (April-June 2020) 65(2):115-123 https://doi.