https://gridopedia.com/planning Construction planning and scheduling reference. New and updated pages. en-gb Mon, 14 Sep 2026 12:29:57 +0000 https://gridopedia.com/planning/activity-coding-structure https://gridopedia.com/planning/activity-coding-structure Codes vs WBS vs UDFs — three places to put information, and why the schedule breaks when they're mixed up 🟩 In one line: The WBS says where an activity… Mon, 14 Sep 2026 12:29:57 +0000 https://gridopedia.com/planning/activity-duration-limits https://gridopedia.com/planning/activity-duration-limits How long is too long — and how short is noise 🟩 In one line: A Level 3 production activity is 5–20 working days; nothing incomplete on a Task activity… Mon, 14 Sep 2026 12:29:57 +0000 https://gridopedia.com/planning/baseline-approval-and-control https://gridopedia.com/planning/baseline-approval-and-control Getting it accepted, keeping it meaningful 🟩 In one line: A baseline is only worth having if it was accepted under the contract, frozen in P6 as a named… Mon, 14 Sep 2026 12:29:57 +0000 https://gridopedia.com/planning/building-a-recovery-plan https://gridopedia.com/planning/building-a-recovery-plan Realistic re-sequencing vs fiction — the plan that survives its first fortnight 🟩 In one line: A recovery plan closes a measured gap with named, costed,… Mon, 14 Sep 2026 12:29:57 +0000 https://gridopedia.com/planning/calendar-on-relationship-lag https://gridopedia.com/planning/calendar-on-relationship-lag The setting that silently shifts dates 🟩 In one line — Tools → Schedule → Options → Calendar for scheduling Relationship Lag decides whether a 7-day lag… Mon, 14 Sep 2026 12:29:57 +0000 https://gridopedia.com/planning/calendar-setup-and-holidays https://gridopedia.com/planning/calendar-setup-and-holidays Working days, Ramadan, monsoon, summer break, planned shutdowns 🟩 In one line — A Gulf project needs five to seven calendars — a 6-day site calendar with… Mon, 14 Sep 2026 12:29:57 +0000 https://gridopedia.com/planning/change-control-in-a-live-schedule https://gridopedia.com/planning/change-control-in-a-live-schedule A variation arrives — what to do, in what order, and what never to touch 🟩 In one line: A change is modelled in a Reflection, quoted through the contract… Mon, 14 Sep 2026 12:29:57 +0000 https://gridopedia.com/planning/choosing-a-delay-method https://gridopedia.com/planning/choosing-a-delay-method Prospective or retrospective, observational or modelled — the decision tree before the analysis 🟩 In one line: The method is chosen by five things — what the… Mon, 14 Sep 2026 12:29:57 +0000 https://gridopedia.com/planning/circular-logic-and-loops https://gridopedia.com/planning/circular-logic-and-loops Finding them and breaking them 🟩 In one line: A loop is a chain of relationships that leads back to where it started (A → B → C → A). P6 refuses to schedule… Mon, 14 Sep 2026 12:29:57 +0000 https://gridopedia.com/planning/cleaning-an-xer-before-import https://gridopedia.com/planning/cleaning-an-xer-before-import Duration fractions, orphan records, unused data 🟩 In one line: Every received XER carries global baggage — calendars, resources, codes, UDFs, cost data —… Mon, 14 Sep 2026 12:29:57 +0000 https://gridopedia.com/planning/commissioning-and-handover-planning https://gridopedia.com/planning/commissioning-and-handover-planning Systems completion, MC/PC and punch lists — the last 15 % of the job that takes 30 % of the time 🟩 In one line: From about month −6, the schedule stops being… Mon, 14 Sep 2026 12:29:57 +0000 https://gridopedia.com/planning/concurrent-delay https://gridopedia.com/planning/concurrent-delay The argument that decides most disputes 🟩 In one line — Concurrent delay is two delays — one the Employer's risk, one the Contractor's — each of which would… Mon, 14 Sep 2026 12:29:57 +0000 https://gridopedia.com/planning/constraints-and-calendars https://gridopedia.com/planning/constraints-and-calendars The two things that quietly break float 🟩 In one line: A constraint replaces logic with a date and a calendar replaces the project's working pattern with a… Mon, 14 Sep 2026 12:29:57 +0000 https://gridopedia.com/planning/construction-sequencing-and-method https://gridopedia.com/planning/construction-sequencing-and-method Turning a method statement into logic — the sequence on paper becomes the links in P6, and each link needs a reason 🟩 In one line: A method statement… Mon, 14 Sep 2026 12:29:57 +0000 https://gridopedia.com/planning/cost-loading-and-cash-flow https://gridopedia.com/planning/cost-loading-and-cash-flow Putting money on the bars — and what the early/late envelope actually tells the client 🟩 In one line: Load cost to match the payment breakdown (not the… Mon, 14 Sep 2026 12:29:57 +0000 https://gridopedia.com/planning/cpli-and-bei https://gridopedia.com/planning/cpli-and-bei Two indices worth understanding before you quote them 🟩 In one line: CPLI tells you whether the remaining critical path can still hit the finish date (1.00… Mon, 14 Sep 2026 12:29:57 +0000 https://gridopedia.com/planning/crew-and-manhour-formulas https://gridopedia.com/planning/crew-and-manhour-formulas The arithmetic underneath every duration 🟩 In one line — Duration in working days equals manhours divided by crew hours per day, where manhours equals… Mon, 14 Sep 2026 12:29:57 +0000 https://gridopedia.com/planning/critical-path-vs-longest-path https://gridopedia.com/planning/critical-path-vs-longest-path Not the same thing, and the difference matters 🟩 In one line The critical path is whatever you define it as — usually "float ≤ 0." The longest path is the… Mon, 14 Sep 2026 12:29:57 +0000 https://gridopedia.com/planning/dangling-activities https://gridopedia.com/planning/dangling-activities Relationships on both sides, still nothing holding the start (or finish) 🟩 In one line: A dangling activity has a predecessor and a successor, so it passes… Mon, 14 Sep 2026 12:29:57 +0000 https://gridopedia.com/planning/dashboards-kpis-and-power-bi https://gridopedia.com/planning/dashboards-kpis-and-power-bi Twelve numbers from the schedule, refreshed at the data date — and nothing the schedule does not already know 🟩 In one line: A planning dashboard shows a… Mon, 14 Sep 2026 12:29:57 +0000 https://gridopedia.com/planning/data-date https://gridopedia.com/planning/data-date The single most misunderstood field in P6 🟩 In one line The data date is the moment the schedule stops describing the past and starts predicting the future.… Mon, 14 Sep 2026 12:29:57 +0000 https://gridopedia.com/planning/dcma-14-point-assessment https://gridopedia.com/planning/dcma-14-point-assessment All fourteen checks, and when failing one is still correct 🟩 In one line Fourteen mechanical tests that tell you whether a schedule is built properly —… Mon, 14 Sep 2026 12:29:57 +0000 https://gridopedia.com/planning/earned-schedule https://gridopedia.com/planning/earned-schedule SPI in time units — so it stops lying to you after 70 % 🟩 In one line: Earned schedule asks "on what date was the baseline supposed to have earned what we… Mon, 14 Sep 2026 12:29:57 +0000 https://gridopedia.com/planning/earned-value-basics-spi-and-cpi https://gridopedia.com/planning/earned-value-basics-spi-and-cpi Three numbers, two ratios, and the one thing SPI cannot tell you 🟩 In one line: Planned value comes from the accepted baseline, earned value comes from… Mon, 14 Sep 2026 12:29:57 +0000 https://gridopedia.com/planning/engineering-and-design-schedule https://gridopedia.com/planning/engineering-and-design-schedule IFC drawings, review cycles — the schedule that decides when construction can actually start 🟩 In one line: Design is scheduled as a chain per deliverable —… Mon, 14 Sep 2026 12:29:57 +0000 https://gridopedia.com/planning/extension-of-time-basics https://gridopedia.com/planning/extension-of-time-basics How an EOT claim is assembled 🟩 In one line — An EOT claim is four things stapled together: a notice given in time, a delay event the contract puts on the… Mon, 14 Sep 2026 12:29:57 +0000 https://gridopedia.com/planning/fidic-time-clauses https://gridopedia.com/planning/fidic-time-clauses What the Red, Yellow and Silver Books actually say about the programme, progress, extensions and damages — 1999 beside 2017 🟩 In one line: FIDIC gives the… Mon, 14 Sep 2026 12:29:57 +0000 https://gridopedia.com/planning/float-ownership-and-the-contract https://gridopedia.com/planning/float-ownership-and-the-contract The clause fight, how it's usually resolved 🟩 In one line: Unless the contract says otherwise, float belongs to the project and goes to whoever needs it… Mon, 14 Sep 2026 12:29:57 +0000 https://gridopedia.com/planning/forecasting-honestly https://gridopedia.com/planning/forecasting-honestly Remaining duration, trend 🟩 In one line: The forecast completion date is only as good as the remaining durations behind it, and a remaining duration is only… Mon, 14 Sep 2026 12:29:57 +0000 https://gridopedia.com/planning/fragnets https://gridopedia.com/planning/fragnets Building a change or delay as a mini-network 🟩 In one line: A fragnet is a small network of activities representing one change or one delay event , built in… Mon, 14 Sep 2026 12:29:57 +0000 https://gridopedia.com/planning/free-float https://gridopedia.com/planning/free-float The one people confuse with total float 🟩 In one line Free float is how long an activity can slip before it disturbs the next activity in line . Total float… Mon, 14 Sep 2026 12:29:57 +0000 https://gridopedia.com/planning/gantt-chart-presentation https://gridopedia.com/planning/gantt-chart-presentation Making a bar chart that a reviewer can read in ninety seconds and cannot misread in twenty minutes 🟩 In one line: A printed Gantt is a legal document the… Mon, 14 Sep 2026 12:29:57 +0000 https://gridopedia.com/planning/hard-logic-vs-soft-logic https://gridopedia.com/planning/hard-logic-vs-soft-logic Physics vs preference; why the distinction decides claims 🟩 In one line: Hard logic is a relationship the physical work forces (you can't pour the slab… Mon, 14 Sep 2026 12:29:57 +0000 https://gridopedia.com/planning/hours-per-day-and-duration-display https://gridopedia.com/planning/hours-per-day-and-duration-display Why an 8-day activity shows as 10 🟩 In one line: P6 stores every duration in hours and converts to days for display using a hours-per-day figure that can… Mon, 14 Sep 2026 12:29:57 +0000 https://gridopedia.com/planning/how-to-become-a-planning-engineer https://gridopedia.com/planning/how-to-become-a-planning-engineer The realistic entry routes, what the job involves day to day, the skills tested at interview, and what separates good planners from average ones. Mon, 14 Sep 2026 12:29:57 +0000 https://gridopedia.com/planning/how-to-review-a-schedule https://gridopedia.com/planning/how-to-review-a-schedule The order to check things in, and what to say 🟩 In one line A schedule review isn't a DCMA run with commentary. It's three questions in a fixed order: is it… Mon, 14 Sep 2026 12:29:57 +0000 https://gridopedia.com/planning/importing-and-exporting-xer https://gridopedia.com/planning/importing-and-exporting-xer Import options, and what each one overwrites — the dialog read line by line 🟩 In one line: The XER import dialog has three decisions — how to bring in the… Mon, 14 Sep 2026 12:29:57 +0000 https://gridopedia.com/planning/justify-a-duration https://gridopedia.com/planning/justify-a-duration What to show when someone challenges a number 🟩 In one line — A justified duration fits on one line: quantity, rate and its source, crew and hours per day,… Mon, 14 Sep 2026 12:29:57 +0000 https://gridopedia.com/planning/leads-and-lags https://gridopedia.com/planning/leads-and-lags Where they are fine and where they hide a problem 🟩 In one line A lag is a delay built into a relationship — "start 3 days after." A lead is a negative lag —… Mon, 14 Sep 2026 12:29:57 +0000 https://gridopedia.com/planning/logic-density-and-quality https://gridopedia.com/planning/logic-density-and-quality How much logic is enough 🟩 In one line: A clean Level 3 construction schedule runs at roughly 1.8–2.5 relationships per activity , with 90%+ of links… Mon, 14 Sep 2026 12:29:57 +0000 https://gridopedia.com/planning/manhour-budget-and-productivity-tracking https://gridopedia.com/planning/manhour-budget-and-productivity-tracking Earned hours over actual hours, weekly, by trade — the number that forecasts the schedule before the schedule does 🟩 In one line: Track every trade weekly as… Mon, 14 Sep 2026 12:29:57 +0000 https://gridopedia.com/planning/measured-mile-and-disruption https://gridopedia.com/planning/measured-mile-and-disruption Why disruption is not delay, how the measured mile works, what makes a comparison period clean, and the records that decide whether the method is available at all. Mon, 14 Sep 2026 12:29:57 +0000 https://gridopedia.com/planning/milestones-and-key-dates https://gridopedia.com/planning/milestones-and-key-dates Contractual, planning and interface milestones — and which ones get a constraint 🟩 In one line: A milestone is either a contractual obligation, an interface… Mon, 14 Sep 2026 12:29:57 +0000 https://gridopedia.com/planning/monthly-progress-report https://gridopedia.com/planning/monthly-progress-report The pack the Engineer actually reads — in the order they read it 🟩 In one line: The monthly report is one pack, assembled in the five working days after the… Mon, 14 Sep 2026 12:29:57 +0000 https://gridopedia.com/planning/monthly-update-checklist https://gridopedia.com/planning/monthly-update-checklist The printable one-pager 🟩 In one line Everything on the statusing-a-schedule page, boiled down to a list you can tick. Print it, pin it above the desk, and… Mon, 14 Sep 2026 12:29:57 +0000 https://gridopedia.com/planning/multiple-calendars-and-float https://gridopedia.com/planning/multiple-calendars-and-float Why float goes strange across calendars on one path 🟩 In one line: P6 measures each activity's float in that activity's own calendar, so one continuous path… Mon, 14 Sep 2026 12:29:57 +0000 https://gridopedia.com/planning/near-critical-paths https://gridopedia.com/planning/near-critical-paths The chains that become critical next month 🟩 In one line: A near-critical path is any chain with total float below the threshold you set — commonly 10 or 20… Mon, 14 Sep 2026 12:29:57 +0000 https://gridopedia.com/planning/nec-accepted-programme https://gridopedia.com/planning/nec-accepted-programme Why the Accepted Programme is the most powerful document a planner ever holds — and the four ways to lose it 🟩 In one line: Under NEC the Accepted Programme… Mon, 14 Sep 2026 12:29:57 +0000 https://gridopedia.com/planning/negative-float https://gridopedia.com/planning/negative-float What it means and what to do about it 🟩 In one line Negative float means the logic says you'll finish later than a date you've told P6 you must hit. The… Mon, 14 Sep 2026 12:29:57 +0000 https://gridopedia.com/planning/notice-requirements-and-records https://gridopedia.com/planning/notice-requirements-and-records The paperwork that wins or loses it 🟩 In one line — More EOT claims fail on a missed notice than on a bad analysis: FIDIC gives 28 days from awareness, NEC… Mon, 14 Sep 2026 12:29:57 +0000 https://gridopedia.com/planning/open-ends https://gridopedia.com/planning/open-ends What they do to the calculation, and the ones that are allowed 🟩 In one line An open end is an activity with no predecessor, or no successor, or both.… Mon, 14 Sep 2026 12:29:57 +0000 https://gridopedia.com/planning/out-of-sequence-progress https://gridopedia.com/planning/out-of-sequence-progress When the actual dates break the logic you built 🟩 In one line Out-of-sequence progress is an activity that has started before its predecessor finished — or… Mon, 14 Sep 2026 12:29:57 +0000 https://gridopedia.com/planning/overtime-and-shift-arithmetic https://gridopedia.com/planning/overtime-and-shift-arithmetic Why twelve hours doesn't buy fifty percent more 🟩 In one line: Extended hours buy a fraction of the calendar time they appear to buy — put the extra hours in… Mon, 14 Sep 2026 12:29:57 +0000 https://gridopedia.com/planning/p6-activity-types-explained https://gridopedia.com/planning/p6-activity-types-explained Task Dependent, Resource Dependent, LOE, WBS Summary and milestones — which one, and what each does to your dates 🟩 In one line: Task Dependent is the… Mon, 14 Sep 2026 12:29:57 +0000 https://gridopedia.com/planning/p6-baselines-assign-and-maintain https://gridopedia.com/planning/p6-baselines-assign-and-maintain Project vs user baseline — one is the contract's yardstick, the other three are yours to compare against 🟩 In one line: A P6 baseline is a frozen copy of the… Mon, 14 Sep 2026 12:29:57 +0000 https://gridopedia.com/planning/p6-constraint-types https://gridopedia.com/planning/p6-constraint-types All eight, and the two that are acceptable 🟩 In one line — P6 offers eight date constraints plus As Late As Possible; on a live contractual schedule you… Mon, 14 Sep 2026 12:29:57 +0000 https://gridopedia.com/planning/p6-duration-types-explained https://gridopedia.com/planning/p6-duration-types-explained Fixed Duration & Units, Fixed Units/Time and the other two — what moves when you edit the third number 🟩 In one line: Every resourced activity holds three… Mon, 14 Sep 2026 12:29:57 +0000 https://gridopedia.com/planning/p6-eps-obs-and-enterprise-data https://gridopedia.com/planning/p6-eps-obs-and-enterprise-data The structures above the project — and why a shared database goes wrong when nobody owns them 🟩 In one line: The EPS says where a project sits, the OBS says… Mon, 14 Sep 2026 12:29:57 +0000 https://gridopedia.com/planning/p6-global-change https://gridopedia.com/planning/p6-global-change The most dangerous button, used safely — one rule, one report, one comparison, then commit 🟩 In one line: Global Change applies an If/Then/Else rule to every… Mon, 14 Sep 2026 12:29:57 +0000 https://gridopedia.com/planning/p6-global-vs-project-data https://gridopedia.com/planning/p6-global-vs-project-data The mess that breaks shared databases — object by object, what is shared, what isn't, and how to convert 🟩 In one line: Everything in P6 is either global… Mon, 14 Sep 2026 12:29:57 +0000 https://gridopedia.com/planning/p6-keyboard-and-speed https://gridopedia.com/planning/p6-keyboard-and-speed Doing the monthly update in half the time — the dozen habits that separate a two-day update from a four-day one 🟩 In one line: Speed in P6 comes from six… Mon, 14 Sep 2026 12:29:57 +0000 https://gridopedia.com/planning/p6-layouts-and-filters https://gridopedia.com/planning/p6-layouts-and-filters The layouts a planner actually keeps — six of them, saved once, used for three years 🟩 In one line: A layout is a saved combination of columns, grouping,… Mon, 14 Sep 2026 12:29:57 +0000 https://gridopedia.com/planning/p6-multiple-float-paths https://gridopedia.com/planning/p6-multiple-float-paths Second and third critical paths — the setting that turns "what's near-critical?" from a guess into a list 🟩 In one line: Multiple Float Paths (Tools →… Mon, 14 Sep 2026 12:29:57 +0000 https://gridopedia.com/planning/p6-professional-vs-eppm https://gridopedia.com/planning/p6-professional-vs-eppm Desktop vs web — same database, different doors, and which one a planner actually needs 🟩 In one line: P6 Professional is the Windows desktop application… Mon, 14 Sep 2026 12:29:57 +0000 https://gridopedia.com/planning/p6-reflections-and-what-if https://gridopedia.com/planning/p6-reflections-and-what-if Testing a recovery without wrecking the live schedule — the sandbox that remembers where it came from 🟩 In one line: A Reflection is a linked copy of a… Mon, 14 Sep 2026 12:29:57 +0000 https://gridopedia.com/planning/p6-schedule-comparison https://gridopedia.com/planning/p6-schedule-comparison Claim Digger by its current name — the report that proves what changed, and the only acceptable proof that nothing did 🟩 In one line: Schedule Comparison… Mon, 14 Sep 2026 12:29:57 +0000 https://gridopedia.com/planning/p6-settings-that-change-your-dates https://gridopedia.com/planning/p6-settings-that-change-your-dates Every setting that silently moves a date — one lookup table, with the page that argues each one 🟩 In one line: Twenty-two settings across Admin Preferences,… Mon, 14 Sep 2026 12:29:57 +0000 https://gridopedia.com/planning/percent-complete-types https://gridopedia.com/planning/percent-complete-types Duration, Physical, Units — three numbers called "percent complete" that measure three different things 🟩 In one line: Duration % is time elapsed, Units % is… Mon, 14 Sep 2026 12:29:57 +0000 https://gridopedia.com/planning/planning-engineer-career-path https://gridopedia.com/planning/planning-engineer-career-path The levels from junior planner to head of project controls, the three forks the career takes, and the specific skill that gates each transition. Mon, 14 Sep 2026 12:29:57 +0000 https://gridopedia.com/planning/pmi-sp-vs-aace-psp https://gridopedia.com/planning/pmi-sp-vs-aace-psp How the two scheduling certifications differ in eligibility, exam format, focus and recognition — and an honest view of what either one is actually worth. Mon, 14 Sep 2026 12:29:57 +0000 https://gridopedia.com/planning/procurement-and-long-lead-items https://gridopedia.com/planning/procurement-and-long-lead-items The schedule most people forget to build 🟩 In one line: Every long-lead item is a chain — submittal, approval, purchase order, vendor drawings, fabrication,… Mon, 14 Sep 2026 12:29:57 +0000 https://gridopedia.com/planning/productivity-adjustment-factors https://gridopedia.com/planning/productivity-adjustment-factors Heat, height, congestion, learning curve 🟩 In one line — A base unit rate assumes normal conditions; real Gulf durations need that rate multiplied by factors… Mon, 14 Sep 2026 12:29:57 +0000 https://gridopedia.com/planning/progress-measurement-and-rules-of-credit https://gridopedia.com/planning/progress-measurement-and-rules-of-credit steps 🟩 In one line: A rule of credit is an agreed formula that turns physical work into a percent complete before anyone is asked for an opinion — pick the… Mon, 14 Sep 2026 12:29:57 +0000 https://gridopedia.com/planning/quantity-tracking-and-physical-progress https://gridopedia.com/planning/quantity-tracking-and-physical-progress The spreadsheet underneath the percent 🟩 In one line: Every Physical % Complete for measured work should trace to a quantity sheet — BOQ quantity, installed… Mon, 14 Sep 2026 12:29:57 +0000 https://gridopedia.com/planning/redundant-relationships https://gridopedia.com/planning/redundant-relationships Links a longer path already covers 🟩 In one line: A redundant relationship is a link between A and C when A → B → C already exists and B's chain is longer or… Mon, 14 Sep 2026 12:29:57 +0000 https://gridopedia.com/planning/relationship-types-explained https://gridopedia.com/planning/relationship-types-explained FS, SS, FF, SF — and why SF is nearly always a mistake 🟩 In one line There are four ways to link two activities. One of them — finish-to-start — should carry… Mon, 14 Sep 2026 12:29:57 +0000 https://gridopedia.com/planning/resource-levelling https://gridopedia.com/planning/resource-levelling What P6's levelling button does, why you almost never press it on a contract programme, and the one way it is useful 🟩 In one line: Levelling delays… Mon, 14 Sep 2026 12:29:57 +0000 https://gridopedia.com/planning/resource-loading-and-histograms https://gridopedia.com/planning/resource-loading-and-histograms Labour by trade, quantities by activity, and the peak nobody can house 🟩 In one line: Load labour by trade as manhours on every production activity, load… Mon, 14 Sep 2026 12:29:57 +0000 https://gridopedia.com/planning/resource-loading https://gridopedia.com/planning/resource-loading Why an unloaded schedule is a design decision rather than a defect, the rule that decides whether to load, and the labour-only middle path most projects need. Mon, 14 Sep 2026 12:29:57 +0000 https://gridopedia.com/planning/retained-logic-vs-progress-override https://gridopedia.com/planning/retained-logic-vs-progress-override The setting that decides your forecast finish 🟩 In one line This one radio button tells P6 what to do when site has started something before the logic said… Mon, 14 Sep 2026 12:29:57 +0000 https://gridopedia.com/planning/revised-baseline-vs-recovery-schedule https://gridopedia.com/planning/revised-baseline-vs-recovery-schedule Two documents, routinely confused — one changes the plan, the other changes the yardstick 🟩 In one line: A recovery schedule shows how the contractor will… Mon, 14 Sep 2026 12:29:57 +0000 https://gridopedia.com/planning/rolling-wave-planning https://gridopedia.com/planning/rolling-wave-planning Detail near, summary far — without hiding scope 🟩 In one line: Detail the next 3–6 months at Level 3 and hold everything beyond it as coded, budgeted Level 2… Mon, 14 Sep 2026 12:29:57 +0000 https://gridopedia.com/planning/s-curves-early-late-and-actual https://gridopedia.com/planning/s-curves-early-late-and-actual Three lines, one envelope — and what to say when the actual leaves it 🟩 In one line: The early and late curves come from the accepted baseline's early and… Mon, 14 Sep 2026 12:29:57 +0000 https://gridopedia.com/planning/schedule-basis-memorandum https://gridopedia.com/planning/schedule-basis-memorandum The document that protects you eighteen months later 🟩 In one line: The schedule basis memorandum (SBM) records what you assumed when you built the programme… Mon, 14 Sep 2026 12:29:57 +0000 https://gridopedia.com/planning/schedule-compression https://gridopedia.com/planning/schedule-compression Crashing vs fast-tracking 🟩 In one line: Compression shortens the critical path either by overlapping work that was sequential (fast-tracking — cheap, adds… Mon, 14 Sep 2026 12:29:57 +0000 https://gridopedia.com/planning/schedule-levels-1-to-5 https://gridopedia.com/planning/schedule-levels-1-to-5 L1 to L5, and who reads which 🟩 In one line — Schedule levels are five layers of the same plan, from a one-page milestone chart (Level 1) to a daily crew… Mon, 14 Sep 2026 12:29:57 +0000 https://gridopedia.com/planning/schedule-narrative https://gridopedia.com/planning/schedule-narrative The report that goes with the programme; what reviewers look for 🟩 In one line: The narrative is the written explanation of what the programme shows and why… Mon, 14 Sep 2026 12:29:57 +0000 https://gridopedia.com/planning/schedule-quality-vs-schedule-realism https://gridopedia.com/planning/schedule-quality-vs-schedule-realism Passing every check is not the same as being achievable 🟩 In one line Quality is whether the schedule is built correctly. Realism is whether it describes… Mon, 14 Sep 2026 12:29:57 +0000 https://gridopedia.com/planning/scheduling-options https://gridopedia.com/planning/scheduling-options The settings dialog that changes your dates 🟩 In one line: Tools → Schedule → Options holds a dozen settings that move dates and float without touching… Mon, 14 Sep 2026 12:29:57 +0000 https://gridopedia.com/planning/setting-up-a-p6-project https://gridopedia.com/planning/setting-up-a-p6-project The settings to get right before you type an activity — because most of them can't be fixed cleanly afterwards 🟩 In one line: Fifteen minutes in Admin… Mon, 14 Sep 2026 12:29:57 +0000 https://gridopedia.com/planning/site-logistics-in-the-schedule https://gridopedia.com/planning/site-logistics-in-the-schedule Cranes, hoists, laydown, access — the constraints that are never in the BOQ and always on the critical path 🟩 In one line: Every logistics item that limits… Mon, 14 Sep 2026 12:29:57 +0000 https://gridopedia.com/planning/slippage-and-trend-analysis https://gridopedia.com/planning/slippage-and-trend-analysis Reading three months of updates — one update is a data point, three are evidence 🟩 In one line: Slippage is how far a forecast date moved since the last… Mon, 14 Sep 2026 12:29:57 +0000 https://gridopedia.com/planning/splitting-in-progress-activities https://gridopedia.com/planning/splitting-in-progress-activities Preparing a revised baseline — what to do with the activity that is half done on the new data date 🟩 In one line: When a revised baseline is built, every… Mon, 14 Sep 2026 12:29:57 +0000 https://gridopedia.com/planning/standard-sequences https://gridopedia.com/planning/standard-sequences Reference logic: structure, envelope, MEP rough-in, finishes, externals 🟩 In one line: Most construction logic is the same job to job — the sequences below… Mon, 14 Sep 2026 12:29:57 +0000 https://gridopedia.com/planning/statusing-a-schedule https://gridopedia.com/planning/statusing-a-schedule The monthly update, done in an order that works 🟩 In one line There's a right order to a schedule update, and it's not the order most people do it in. Get… Mon, 14 Sep 2026 12:29:57 +0000 https://gridopedia.com/planning/subcontractor-and-interface-integration https://gridopedia.com/planning/subcontractor-and-interface-integration One schedule, many authors — how to take a subcontractor's programme without letting it take yours 🟩 In one line: Subcontractor programmes are inputs, not… Mon, 14 Sep 2026 12:29:57 +0000 https://gridopedia.com/planning/tender-programme https://gridopedia.com/planning/tender-programme Planning at bid stage — the programme that prices the job, and may become the contract 🟩 In one line: The tender programme is a Level 2 programme (Level 3… Mon, 14 Sep 2026 12:29:57 +0000 https://gridopedia.com/planning/time-impact-analysis https://gridopedia.com/planning/time-impact-analysis How it's built and where it gets attacked 🟩 In one line — A TIA inserts a small network representing the delay event into the last accepted update before the… Mon, 14 Sep 2026 12:29:57 +0000 https://gridopedia.com/planning/total-float https://gridopedia.com/planning/total-float What each float type actually measures, how P6 calculates it, why high float usually means missing logic, and what negative float is really telling you. Mon, 14 Sep 2026 12:29:57 +0000 https://gridopedia.com/planning/verifying-subcontractor-progress https://gridopedia.com/planning/verifying-subcontractor-progress When their 80% is your 55% 🟩 In one line: A subcontractor's percent is a payment claim, not a progress measurement — verify it against your own rule of… Mon, 14 Sep 2026 12:29:57 +0000 https://gridopedia.com/planning/wbs-structure-design https://gridopedia.com/planning/wbs-structure-design Building one that survives three years — because you cannot rebuild it in month fourteen 🟩 In one line: The WBS is the one hierarchy every activity belongs… Mon, 14 Sep 2026 12:29:57 +0000 https://gridopedia.com/planning/weekly-report-and-look-ahead https://gridopedia.com/planning/weekly-report-and-look-ahead The weekly cycle is for making next week happen — not for rescheduling the programme 🟩 In one line: Every week the planner issues a three-week look-ahead… Mon, 14 Sep 2026 12:29:57 +0000 https://gridopedia.com/planning/weekly-vs-monthly-cycles https://gridopedia.com/planning/weekly-vs-monthly-cycles What gets updated when, and by whom 🟩 In one line: The weekly cycle runs the site — a look-ahead, a percent-complete sheet and a short list of constraints —… Mon, 14 Sep 2026 12:29:57 +0000 https://gridopedia.com/planning/what-is-an-xer-file https://gridopedia.com/planning/what-is-an-xer-file Structure, tables, what's actually inside 🟩 In one line: An XER is a plain tab-delimited text file that carries a P6 project as a set of database tables —… Mon, 14 Sep 2026 12:29:57 +0000 https://gridopedia.com/planning/xer-file-won-t-import https://gridopedia.com/planning/xer-file-won-t-import Common causes and fixes 🟩 In one line: Nine times out of ten an XER that won't import has one of five problems — a newer version number in the header , a… Mon, 14 Sep 2026 12:29:57 +0000 https://gridopedia.com/planning/planner-and-project-managerhttps://gridopedia.com/planning/planner-and-project-managerWho owns the plan, who owns the dates, and what to do when a project manager asks for a change to the schedule that you cannot justify.https://gridopedia.com/planning/planning-vs-scheduling-vs-project-controlshttps://gridopedia.com/planning/planning-vs-scheduling-vs-project-controlsThree job titles used interchangeably, what each one actually owns, and the single skill that gates the step from scheduling into project controls.