object of study : a process, product, or any form of model
purpose to characterize (what is it?), evaluate (is it good?), predict (can I estimate something in the future?), control (can I manipulate events?), improve (can I improve event?)
focus: the aspect of the object of study that is of interest, e.g., reliability of the product defect detection prevention capability of the process, accuracy of the cost model
point of vlew the person who benefits from the information, e.g., the researcher in understanding something better