S-Curve Analysis
An S-curve plots cumulative planned versus actual progress over time — giving project teams, clients, and contract administrators a clear visual picture of whether a project is ahead, on track, or behind. Deltime produces S-curves directly from the programme, loaded with the right resource or value data to make them meaningful.
What an S-Curve Shows
An S-curve plots cumulative planned value or resource against actual and earned value over the project duration. The characteristic S-shape reflects slow start-up, rapid mid-project production, and tapering close-out. Deviations from the planned curve identify slippage early — before it becomes a programme crisis.
Resource-Loaded Programmes
An S-curve is only as reliable as the programme it comes from. Deltime loads Primavera P6 and Asta Power Project programmes with labour, plant, and material resources by activity — producing S-curves that reflect the actual planned production profile rather than a generic assumption.
Earned Value Analysis (EVA)
Deltime applies earned value methodology to produce Schedule Performance Index (SPI) and Cost Performance Index (CPI) metrics from the programme data. EVA gives a project team an objective, quantified view of whether they are delivering planned value on time — and a forecast of the final outturn if current trends continue.
Cash Flow Forecasting
For contracts where cash flow visibility matters — particularly NEC Option C and FIDIC target cost contracts — Deltime produces cost-loaded S-curves showing forecast expenditure against the contract programme. These support monthly applications, financing requirements, and client reporting.
Monthly Reporting Integration
S-curves are produced as part of Deltime's standard monthly reporting pack — updated each period to show the current planned, actual, and earned value curves side by side. Narrative commentary explains the causes of any divergence and the forecast trajectory to completion.
Delay & Acceleration Modelling
When delay events occur or acceleration is instructed, Deltime re-baselines the S-curve to show the new planned profile — demonstrating the impact of the delay on the resource loading and cash flow forecast, and supporting the quantification of prolongation costs.
Resource-Loaded S-Curve — Data Centre Delivery, London
Representative figures from an S-curve reporting package produced by Deltime on a major NEC4 data centre project.