LD50 redirects here. For other uses, see LD50 (disambiguation) . In toxicology, the median lethal dose, LD50 (abbreviation for  lethal dose, 50%), LC50 (lethal concentration, 50%) or LCt50 is a measure of the lethal dose of a toxin, radiation, or pathogen.
In an employee-initiated review system, employees are informed that they can ask for a review from their manager. This type of on-demand appraisal is not meant to replace a conventional review process. Rather, it can be used to promote an attitude of self-management among workers.f a small business uses merit-based increases, the appraisal form would include a rating of the employee on certain tasks. If skill-based pay is used, the appraisal would list skills acquired and level of competency.
Thus performance appraisal aims at 'feedback, development and assessment.' The process of performance appraisal should concentrate on the job of an employee, the environment of the organization, and the employee him-or herself. These three factors are inter-related and inter-dependent.erformance appraisal should also aim at the mutual goals of the employees and the organization. This is essential because employees can develop only when the organization's interests are fulfilled.