In the blog we talk about the utilization of COCOMO II ( Constructive Cost Model ) to appraise the cost of programming designing . The COCOMO II which enable us to appraise the cost, exertion and booking when arranging new programming advancement . The exertion condition direction is to locate the quantity of people by months which is expected to finish the task and span condition to determined the quantities of months which is required to finish this undertaking. This blog express how actualized COCOMO II show condition about similar information in various dialect we pick C and OOP(C++), we make the investigation of these two program and we going to infer that connection amongst exertion and length was forward connection, we need to clarify that when exertion expanding span will expanding in the creator side. Key Points : COCOMO II , Estimation Model, Cost Estimation Model , Effort Equation, Schedule Equation . 1. Presentation COCOMO II ( Constructive Cost Model ) is the model that permits to assess the cost , exertion, and calendar when arranging another product improvement exercises . It comprises of three sub models, every one offering expanded honesty the further a long one is in the undertaking arranging and outlining process. Recorded expanding devotion, these sub models are known as the applications piece, early outline and post – engineering model. COCOMO II is helpful for a more extensive accumulation of strategies and advances. COCOMO II gives a la mode support to business programming , question situated programming , programming made by means of transformative improvement models and programming created utilizing business off the rack applications piece utilities (Boehm ) . COCOMO II incorporate the application organization show (for early prototyping endeavors) and the more point by point Early Design and Post Architecture demonstrate (for the consequent bits of the life cycle). 2. Target of Software Cost Estimation with COCOMO II The most central computation in the COCOMO II display is the utilization of the exertion condition t o evaluate the quantity of individual/months required to build up a venture. The vast majority of the other COCOMO II comes about including the assessments for necessities and support , are gotten from this quantity.or settling on great administration choices. It is additionally associated with deciding how much exertion and time a product venture requires . Cost estimation has a few uses : a. It builds up a firm, solid spending plan for a – in house venture. b. It encourage aggressive contract offers. c. It figures out what is best for the association. Programming cost estimation gives the imperative connection between the general ideas and procedures of financial examination and the specific universe of programming building . d. Estimation Models Assessing models have been produced by the estimating certain properties and qualities (like length, cost, group measure, plate utilization, and so on… .) of past fruitful undertakings. Bends are then fit to the information focuses to get the expressive conditions which are the models. We seek these conditions can be utilized after the forecast. The idea that they originated from estimations of past activities is the thing that gives the expectation. A. Little Projects: Estimations of little to direct undertakings brought about a model of the accompanying structure: Exertion = a * SIZE + b Here, the greatness of the exertion is a straight capacity of the measure of the undertaking ( Number of Lines of Code, normally ). This model holds up until a specific point, for the most part for ventures that can be sensibly expert by little groups of a few people. By expanding the extent of the undertaking, the above model turns out to be less and less exact and the requirement for another model increments. B. Expansive Projects: Ventures requiring groups of more than three or so individuals have a tendency to carry on in the accompanying way: Exertion = a * SIZE b Here, the span of the venture is scaled exponentially, along these lines as an item increments in measure, the push to deliver the item develops more than directly ( for b >= 1). It implies that in the event that we endeavor to build up a bigger item, our efficiency ( SIZE/EFFORT ) Decreases. This diminishing in profitability on bigger undertakings is known as a diseconomy of scale. The principle reasons why bigger programming items cause diseconomies of scale are the accompanying: a. Moderately more item configuration is required to build up the careful unit-level determinations required to help the parallel movement of a bigger number of software engineers. b. Generally more exertion is required to confirm and approve the bigger prerequisites and plan particulars. c. Indeed, even with an altogether characterized detail, developers on a huge undertaking will invest generally more energy imparting and settling interface issues. d. Generally more incorporation movement is required to assemble the units.