The inclusion of Computer Studies education at the upper basic level in Nigeria is to equip students with the knowledge of entrepreneurial skill. Studies have revealed that students who graduated at this level appear not to be equipped in this skill. Available literature, focused on the use of computer resources in teaching and learning processes, with only a few addressing the implementation of computer studies curriculum. This study, therefore, evaluated the implementation of computer studies curriculum with respect to teacher experience, area of specialization, resources availability and adequacy at the upper basic level of education in Cross River. Expost-facto design with Robert Stake's evaluation model-Antecedent, Transaction and Outcome were used. Simple random sampling was used to select two educational zones (Ikom and Calabar), Purposive sampling was used to select schools with computer laboratories. Proportionate to size technique was used to select 41 schools (21 from Ikom and 20 from Calabar educational zone). Public and private schools JSS 1, 2 &3 were randomly selected. In all, 123 classes, 2127 students and 63 computer studies teachers participated. Resources Availability Checklist (RAC), and Structural Interview Guide were used for data collection. Data were analysed using descriptive statistics. Forty-three percent of the teachers had five years teaching experience, with 17.0% specializing in computer studies; 70.0% of the resources (printer, computers) were inadequate and 70.0% of the students have not acquired skills/competence of using the computer system. Also, overcrowded classes, lack of incentive from the government, Finance to maintain the laboratory, qualified and shortage of teachers, power failure among others are factors militating against effective implementation of computer studies curriculum. Computer studies curriculum at the upper basic level was not effectively implemented in Cross River State. Thus, for the teaching of computer studies to be effective, qualified teachers should be employed and the necessary resources are made available.