With the principal tool in the planned phase of project management, result ones or work of project (work) details division (breakdown) doing, layered structure (structure) with the diagram or that diagram which it converts the whole scopeof project and result ones which among those are made or relationship of job it is the technique which systematically you gather and summarize & grasp.
WBS compilation with the work of doing in first stage of project plan, must be executed with project, all work washing finish, it becomes something which clarifies the control unit in project management simultaneously. WBS after that estimate of project man-hour, schedule (network figure), of supply management (outside order conversion judgement), resource allocation plan (), such as budget such as role allotment chart/cost management (beingsomething which becomes the base of the phase such as), risk management such as EVMS, becomes management the basis of the whole project.
The basic making of WBS decides the purpose of project first, final result ones (the product, service and the result etc.) decides concretely. The result ones & it keeps dividing to the element and intermediate result ones next defining. The method, the authorized personnel getting together, is approach and that combined use approach etc. which from approach and superior last result ones which keep investigating the element in bottom-up it keeps dividing to top down. When at project start stage the element is indefinite, just rough division classification is defined, project advances following, it subdivides.
The section of classification rearrangement is develops job result ones which become the object (a method, are rearranged with purpose and expedient a method, a procedure and according to job flow a method etc. which divide) every component such as product. Depth of each branch the ? is good not to be even, but the disassembly standard in one turning point must be standardized.
The WBS element of lowest layer level of the WBS each branch is calledthe workpackage often. As for the work package, the case where project is executed because it is the control unit, grain size of the respective subdivision, it is desirable for meaning to have been even. When if result ones are shown, there is a work package, when it assumes that job (task and activity) is, it is, (later description).
When WBS completes, all activities (really you must do, the work) it means to be defined. If this is executed entirely, project becomes completion. Because it can allot to the respective activity, duration/cost/the resource etc., it becomes possible to manage project quantitatively.
WBS is expressed the diagram, but as the coming out and overlapping of the element/job are prevented by the fact that this is drawn up, it is possible to cancel the gap of recognition between the project authorized personnel. Tabular format or the tree figure (the logic tree) is used generally in the diagram, but the items which the indent are done (the outline), it is possible also to draw up with the mind map and the like. Furthermore, in the WBS figure the WBS element is displayed with short name, but with just that in insufficient casethe WBS dictionary is serviced.
Can the technique, WBS, look at prototype inthe dissertationregarding the early PERT technique which is announced in 1959. PERT being derived from the missile development of the US Navy, among these hierarchical detailing, the method was adopted managing the development object - - sub-launched ballistic missile & system - -. It succeeds this thought, in 1968 the troop standard MIL-STD-881 which is decided as WBS standard of the troop supply item (in 1998 reform) with, for example as for as the boat "" "hull construction" the "promotion office" the "electric room" "supervision direction" the "equipment fixture"...... with said, it is defined to MIL-HDBK-881. In other words, the work referred to here (work) that "work" "product" is meant, you can think, you probably can say that it is something which is suitabletothe BOM concept which is used with the present manufacturing industry.
Even with PMBOK whoseis widely used about MIL standard is not explicit, but the work package of the WBS lowest layer unit displays result ones, allots activity to that (also allotment of plural activities to be) has supposed form.
On the one hand, there is a tendency which considers work "job" e.g., in US WBS is translated "detailed structure" job detailed drawing "of job" and, (in the literature of production control type also the meaning, "constitution primary factor classification schedule" is visible). Even with International Standard ISO of project management 10006 as for clear definition although it is not shown, there is a place where work can be considered activity in the text. WBS shows the structure "of job" in part, separates from this and PBS which shows the structure of "result ones"(product breakdown structure) the method of forming is lectured. Concerning whether in such point, result ones whether job there is somewhat confusion.
Furthermore in PMBOK, in 2000 edition as result ones in "the scope definition process" of the project scope management knowledge area, WBS was listed, but in 3rd edition "WBS compilation process" becoming independent in the same knowledge area, it was provided. This means the fact that WBS is located when it is one of the basic important matter which controls project clearly.
Making use of WBS similar and thought of gradual detail organization of the project member OBS which showslayered structure, (cost breakdown structure)there is CBS which shows the cost structu(organization breakdown structure)re of project, adjusts to WBS and it makes three large elements which form project management. Making OBS, CBS and PBS etc. WBS and matrix condition cross, also the method is well known the association and result ones (job) with, organization (2 dimensions or of grasping the charge patsy) and cost multidimensionally.
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