Line of balance and elemental trend analysis Project management.

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Presentation transcript:

Line of balance and elemental trend analysis Project management

Line of Balance (LoB) A conventional network technique applied to develop and control a single batch. It was developed as a production planning tool before PNTs. It has a much less wide application area.

Requirements of LoB Identifiable stages in production to exert managerial control. Known manufacturing times between stages. Delivery schedule. Resources can be varied as required.

Elemental trend analysis (= LoB) requirements Items in the batch are independent of each other Same resource carries out the same activity on every item of the batch Only one resource can work on a given item Any resource constraints must be removed before the analysis

Where it is useful? Construction industry Heavy engineering assembly Road or railway building … Why not using a PNT here?

Problem solving example There is a project of building 5 identical row houses. On each house 4 work units (items) should be made, each by a specialized team of workers: – Foundations (team A): 1 month per house, – Brickwork (team B): 2 months per house, – Roof construction (team C): 2 weeks per house, – Internal works (team D): 1 month per house a)Plot a LoB chart. Follower team can start working on a given unit immediately after the predecessor team finished. Calculate the TPT. b)Redesign the LoB chart to eliminate idle time of teams and minimize the TPT.

Solution (a) Month 1Month 4Month 3Month 2Month 6Month 5Month 7 House 1 House 3 House 2 House 4 House 5 Month 8 Month 11Month 12 Month 9 Month 10 TPT 12.5 months Month 13

Solution (b) Month 1Month 4Month 3Month 2Month 6Month 5Month 7 House 1 House 3 House 2 House 4 House 5 Month 8 Month 11Month 12 Month 9 Month 10 TPT 14 months Month 13Month 14

Control with LoB If the 2 nd team performing only on 75%...

Control with LoB Month 1Month 4Month 3Month 2Month 6Month 5Month 7 House 1 House 3 House 2 House 4 House 5 Month 8 Month 11Month 12 Month 9 Month 10Month 13Month 14Month 15Month 16Month 17 TPT 17 months

Thanks for the attention