Performance metrics for capex monitoring across the full life cycle

The problem of investment projects efficiency assessment and commensurability of long-term effectiveness for the full payback period remains relevant for strategic planning.
In long term monitoring of capital expenditure profitability, we suggest to measure the effect of project for the accounting date in absolute terms by the Net Interim Value (NIV)
of accumulated cash flow. Based on this approach we also suggest using the Average Profitability Index (API) as a relative metric to assess the rate of investment profitability.

And aggregated assessment of return on investment of the whole investment program can be made as Weighted Average Profitability Index (WAPI) with terminal investment values as weights for pojects. The profitability monitoring database is a source of knowledge for costs engineering over the full investment life cycle and a digital value management tool.