The day-to-day activities of business, even in the smallest of firms, are complex, with multiple activities occurring concurrently, sequentially or both. The interaction of activities is often critical to successfully executing the overall business strategy. Each functional area plays a part. Marketing identifies and targets sales opportunities while sales closes the deal. Production creates the goods or service. Human resources finds and develops personnel. Finance provides the funds and accounting keeps track of financial activities. None of these functional areas operates independently. The customer purchases the goods or service to satisfy needs. Operations provides the goods or services to satisfy those needs.