<prompt> Translate the following text to EnglishKila mfano hutumia madereva ya gharama, ambayo ni vigezo kama vile kiwango cha uzoefu wa programu, mahitaji ya kuegemea ya programu, na utata wa mradi, pamoja na ukubwa wa mradi uliokadiriwa, kupata gharama ya jumla na makadirio ya ratiba ya ununuzi.  <response>: Each model uses cost drivers, which are parameters such as the level of experience of the programmers, the reliability requirements of the programs, and the complexity of the project, along with the estimated project size, to derive overall cost and schedule estimates for the acquisition. 