abstract water is a vital resource for every biological and human phenomena. nowadays, water management and conservation has a great importance not only in developing countries, but also in developed countries. in traditional economics, water is not taken into consideration as a factor of production in the national accounts. nevertheless in reality, water is the primary input of many goods and ...

background: one of the important challenges to health service policy makers is conservation of human resources. shortage of human resources in health and care sector damages quality of services. another problem of organizations is low organizational commitment, which may result in poor performance and high costs reflecting improper use of human resources. committed employees set the scene for g...