Estimating and planning software allows us to view the estimating, planning cost-benefit relationship of various activities, setting the stage for forecast management and assisting in making more informed decisions. A contractor begins with the initial estimate and planning of costs and continues through cost tracking and analysis of the information collected and includes valuations and decisions based on information provide in the 3D model and documentation from the tender stage.
There is no set blueprint for construction management systems, and these systems may be organized differently to meet different organizational needs. The crucial and fundamental element is an overall understanding of the interrelationship between project BIM model, and control as well as the ability to share certain correspondence, manage and record information on a project from tender stage through to completion that can be stored in the 3D model provided to the Contractor at tender stage. This model is often referred to as the BAM model(Building Assembly Modelling)
Estimating Enviroment for a contractor
Estimating is the major component of construction and it exchanges data with all other 3rd party application and can be importated in the BIM model components. Estimating software is a resource and production based analytical estimating system that divides quantities and rates naturally into pre-tender and post-tender, and includes: Take-off and bill preparation, Electronic bill importing, Estimating, Subcontract adjudication and enquiry, Material adjudication and enquiry, Project analysis, Valuations, Cost reconciliation, Subcontract control and liability.
The Bid Stage
The estimating tool is used at inception by the Estimator in preparation and finalisation of the estimate. The tender program is generated by the designated Chief Estimator and stored in the CDE (Common Data Enviroment) and notifies the estimating and planning team who intern provide estimating and planning information to the tender program. Once the program and estimate is complete, a dynamic link needs to be created ensuring that every bill item is attached to an activity bar in time. The dynamic link will facilitate the generation of budget and cash flow forecasts throughout the project life cycle.
The Contractual Stage
Once the job has been awarded to the company the estimator will hand over the job to a proposed site team. The designated site personal will revisit the job to ensure that the job is void of errors and that there are no plugged or split rates that will hinder the reporting processes. The site team will also attempt to reduce the estimate resource cost to attain buying profit that can be used for compensation against rework or repair work without affecting the tendered profit. They also revisit the program to access the float provisions and the production variances between the estimate and the program and manage so as to manage the job accordingly. At the end of the contractual stage the site team would have established a new base line to manage themselves against.
On Site Stage
The job commences and site management will track the program in along with the information and long lead items that can be seen as bars or symbols on the program. The Quantity Surveyor will then, at the end of the first financial month produces his valuation to the client and submit to the client in accordance to the contract. The dynamic link also assists management in determining whether the Quantity Surveyor has claimed for all work complete for the stipulated period, by allowing the backwards generation of a valuation from a tracked program that has the time now that co-insides with the valuation close-off date. The accuracy of the resultant valuation will determine the accuracy of the resultant valuation. The budget and cashflow to completion will, due to the dynamic link, be update accordingly and will hence reflect the remaining value over the remaining time. On certification of the valuation that was submitted to the client, the paid quantities will be entered into the estimating system to determine variances between actual quantities, claimed quantities and paid quantities. The actual quantities, measured to a date that co-insides with the close of cost date, will produce the allowable that can be uploaded into the accounting system to carry out cost versus allowable variances to determine the financial status of the project.