The book covers a study that was to establish the effect of outsourcing on organizational performance with specific reference to Spectre International, Kisumu. Guided by a conceptual framework where the dependent variable was organizational performance and independent variable is outsourcing, the study adopted a case study research design. The target population was 50 employees drawn from the top management, the plant supervisors and subordinate staff. Purposive sampling technique was used to select the managers and random sampling technique used to select the supervisor and the subordinate's staff members. The data was analysed using descriptive statistics and the relationship between the variables under study drawn using Pearson's correlation analysis. The findings were presented in form of tables. The study established that outsourcing at Spectre International positively contributed to cost efficiency to a large extent as evidenced by an overall mean and standard deviation of (M = 4.25, SD = 0.74).