How the numbers are calculated

PSMS calculates every figure the same way on every page and report. This page explains each one in plain terms, with a worked example: a 100-day contract that starts on January 1, so day 1 is January 1.

Days

• Day 1 is the start date. A date's day number is the number of days since the start, plus one.
• Calendar days elapsed = the as-of date's day number (0 before the contract starts).

Expiry dates

Date	Rule	Example
Original expiry	start + duration − 1 (the last day of the contract)	April 10
Expiry due to suspensions	original expiry + days suspended	April 20, after 10 days suspended
Expiry due to time extensions	original expiry + approved time-extension days	April 25, after a 15-day extension
Revised expiry	one of the two above, chosen in office settings (suspensions by default)

A contract is overdue when it isn't completed and the as-of date is after its revised expiry.

Suspensions

• A suspension counts the days from its effective date up to, but not including, its resume date. Suspended on January 11 and resumed January 21 = 10 days.
• A suspension that hasn't resumed counts up to the as-of date.
• If a contract is completed while a suspension is still open, the suspension ends at completion.

Time elapsed

• Contract time = duration + approved time-extension days.
• Contract time elapsed = calendar days elapsed − days suspended.
• % time elapsed = contract time elapsed ÷ contract time. It stops increasing once the contract is completed.

Target, actual and slippage

• Target (% work programmed) is read from the schedule at the contract time elapsed. Because suspended days are taken out, the plan pauses while work is suspended. That's the revised plan line on the S-curve.
• Actual (% work accomplished) is read from your accomplishment entries at the calendar days elapsed.
• Between two entries (or schedule points), PSMS draws a straight line; before the first it starts from 0% at day 0; after the last it stays level.
• Slippage = actual − target. Negative means behind schedule.

Example: with 50% planned at day 50 and 100% at day 100, suspended for 10 days, on day 30 the contract time elapsed is 20 days, so the target is 20%. If 30% has been accomplished, the slippage is +10%.

Completion and status

• A contract is completed on the date of its first accomplishment entry of 100% (on or before the as-of date).
• After completion the target keeps moving with the calendar, so a finished contract ends at target 100%, actual 100%, slippage 0%.
• Status is Not started before the start date, Completed once completed, Suspended while a suspension is open, and Ongoing otherwise.

Amounts

• Revised amount = the revised amount on the latest variation order effective on or before the as-of date; without variation orders it's the contract amount.
• Value accomplished = revised amount × actual %.
• Billing % = cumulative billing ÷ revised amount on the billing date.
• Cost incurred to date (PPA report) = the latest cumulative billing on or before the as-of date.

Projects

• Project accomplishment = value accomplished by the project's contracts ÷ the project's allocation. Project target is the same with target % instead of actual.
• A contract shared by several projects counts toward each in proportion to the projects' allocations.
• Obligated = expenditures obligated on or before the as-of date; disbursed = expenditures disbursed on or before it.
• Unobligated balance = allocation − obligated. Utilization = obligated ÷ allocation.

Totals across contracts

• Overall accomplishment (dashboard, report summaries) = total value accomplished ÷ total revised amount.
• Overall S-curve: each contract's revised-plan and actual curves, weighted by its share of the total revised amount, added together for each date.
• Contract totals and reports include contracts with a contractor and exclude work by administration.