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Teaching Case — One Person, Two Tasks, Same Fortnight

Two bars drawn side by side look like two things happening in parallel, and they are — unless the same person is on both. Sam is booked at 200% for a fortnight here. The bars are the correct bars; the plan is still impossible. The engine sweeps every resource against its declared capacity and says who, when, and on what.

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Agency — two clients at once — Gantt chart with critical path6 tasks; from 2026-07-06 to 2026-08-11, 27 working days; 3 on the critical path; 2 errors, 0 warnings, 0 questions unanswered.Agency — two clients at onceMo 6 Jul 2026 → Tu 11 Aug 2026 · 27 working days · 37 calendar dayscritical path: nw1 → nw2 → nw3shorten first: nw1 (up to 5d) · nw2 (up to 4d) · nw3 (up to 4d)Jul 2026Aug 2026Mo6Tu7We8Th9Fr10Sa11Su12Mo13Tu14We15Th16Fr17Sa18Su19Mo20Tu21We22Th23Fr24Sa25Su26Mo27Tu28We29Th30Fr31Sa1Su2Mo3Tu4We5Th6Fr7Sa8Su9Mo10Tu11NorthwindHarbourline▲ Discovery5d · shorten → 5d · sam▲ Design system10d · shorten → 4d · sam▲ Build12d · shorten → 4d · danaBrand audit4d · float 15d · danaCampaign concepts10d · float 4d · samProduction8d · float 4d · danaResource loadSam IyerDana Novakcritical — zero floatnear-criticalhas floattotal floatmilestonenon-working daybaselineEvery check ran. 2 errors, 0 warnings.✕`sam` is booked at 200% of a capacity of 100% from 2026-07-13, on 2 tasks at once (`nw2`, `hl2`) — these bars are drawn side by side as if they happen in parallel, and one person cannot do that. `hl2` has4 working days of float, though none of it is free, so moving it pushes its successors, which is where a re-sequence would start.✕`dana` is booked at 200% of a capacity of 100% from 2026-07-27, on 2 tasks at once (`nw3`, `hl3`) — these bars are drawn side by side as if they happen in parallel, and one person cannot do that. `hl3` has4 working days of float (4 working days of it free, so that much can be taken without moving anything downstream), which is where a re-sequence would start.·Mo 6 Jul 2026 to Tu 11 Aug 2026 — 27 working days across 37 calendar days, on a Mo–Fr week·one critical path, through 3 tasks — shortening any one of them shortens the project, up to the point another path becomes binding·to finish sooner, shorten `nw1` by up to 5 working days (the whole task); `nw2` by up to 4 working days (then the next-longest path becomes binding); `nw3` by up to 4 working days (then the next-longestpath becomes binding). Anything beyond those figures moves nothing — the gain from taking δ days off a task is min(δ, the figure above), and it is zero for every critical task not listed here.

Make it your own.

title "Agency — two clients at once"
start 2026-07-06
calendar mon-fri

resource sam  "Sam Iyer"
resource dana "Dana Novak"

section "Northwind"
  task nw1 "Discovery" 5d assign sam
  task nw2 "Design system" 10d after nw1 assign sam
  task nw3 "Build" 12d after nw2 assign dana

section "Harbourline"
  task hl1 "Brand audit" 4d assign dana
  task hl2 "Campaign concepts" 10d after nw1 assign sam
  task hl3 "Production" 8d after hl2, hl1 assign dana