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.
Types of Performance Appraisal Methods. A variety of appraisal methods are readily available today to measure performance quality and quantity. Each appraisal method is plausible or effective in gauging employee productivity as engaged by different organizations. Hence, each performance appraisal tool or technique should not be dismissed hastily or rashly accepted unless the it fits the exact needs of the company with benefits to the employees.