To examine in order to prevent errors/a problem.

not same as another or each other.

person who purchases goods and services. People who buy goods or services.

manufactured article or substance.

look at or observe attentively over period of time.

person who buys goods or services from shop or business.

achieving maximum productivity with minimum wasted effort or expense.

To rain very heavily.

action of helping or doing work for someone. Maintenance of machineries so it runs well, e.g. cars. To help or do work for someone, e.g. in a store.

sending and processing of mail and similar electronic communications. To communicate using text.

publicizing of product etc.. Movement to a higher position or rank in a company.

course of action. Series of actions meant to achieve goals. To work in an organized, active way towards a goal.

facts provided or learned.

forming or viewed as unit apart or by itself. individual items of clothing suitable for wearing in different combinations. To live away from your husband or wife.

used for emphasis with following adjective functioning as adverb. Thing that is not yet known or named.