(a) a point-of-sales system
the definition of pos system/software is mainly to process sales. however, modern point-of-sale system/software does so much more than that. full-featured pos systems can handle inventory tracking, customer data management, analytics, employee management, monitoring and reporting of sales, and makes them available for use by the finance departments.
a. relational database
by cross-training employees it does not benefit employers because there is no decreases in employee wages. just because employees are cross-trained and are learning new skills - the wages do not go down for these employees, in fact, in most cases they may even rise due to their increased skill set. they also are able to increase productivity if there is an employee absent because the cross-trained employee is able to cover for them.