This document discusses job performance and its measurement. It defines job performance as the expected value added by an employee's behaviors over time. Job performance consists of two types: task performance, which directly contributes to producing goods/services as defined in the job description, and contextual performance, which supports the organizational environment through behaviors like cooperation. Several articles are summarized that discuss factors influencing job performance like personality, interpersonal skills, creativity, and leadership. Performance is best measured through a combination of objective, judgment-based, and personnel measures.