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A cost estimate is the approximation of the cost of a program, project, or operation. The cost estimate is the product of the cost estimating process. The cost estimate has a single total value and may have identifiable component values. A problem with a cost overrun can be avoided with a credible, reliable, and accurate cost estimate. A cost ...
Cost engineering is a field of engineering practice that began in the 1950s (AACE International was founded in 1956). The skills and knowledge areas of cost engineers are similar to those of quantity surveyors. AACE International is one of many international engineering organizations representing practitioners in these fields.
AACE is the publisher of Cost Engineering, a bi-monthly technical journal, Skills and Knowledge of Cost Engineering (currently in its 6th edition), Source magazine (a bi-monthly magazine), 20 different AACE International Professional Practice Guides, approximately 120 Recommended Practices, and its most comprehensive publication, the Total Cost ...
AACE International has defined contingency as "An amount added to an estimate to allow for items, conditions, or events for which the state, occurrence, or effect is uncertain and that experience shows will likely result, in aggregate, in additional costs. Typically estimated using statistical analysis or judgment based on past asset or project ...
In 2006, AACE published their Total Cost Management Framework – An Integrated Methodology for Portfolio, Program and Project Management. [2] In this tested and proven methodology, portfolios of assets are optimized through the use of portfolios of projects, using project management as a delivery system, to support and enhance large, strategic or operational programs [3] in support of the ...
Research in the software industry on the cone of uncertainty stated that in the beginning of the project life cycle (i.e. before gathering of requirements) estimates have in general an uncertainty of factor 4 on both the high side and the low side. [3] This means that the actual effort or scope can be 4 times or 1/4 of the first estimates.
A Allocation of costs is the transfer of costs from one cost item to one or more other cost items. Allowance - a value in an estimate to cover the cost of known but not yet fully defined work. As-sold estimate - the estimate which matches the agreed items and price for the project scope. B Basis of estimate (BOE) - a document which describes the scope basis, pricing basis, methods ...
A typical multiplier for a new unit within a refinery would be in the range of 5.0. When the purchase price of all the pumps, heat exchangers, pressure vessels, and other process equipment are multiplied by 5.0, a rough estimate of the total installed cost of the plant, including equipment, materials, construction, and engineering will be achieved.