--- title: "Planning in dynamic environment; linked bar chart" subject: "Project Engineering" chapter: 3 key: "semester_7/project_engineering:planning-necessary-dynamic-linked-bar" source: https://www.bctengineer.com/q/semester_7/project_engineering/planning-necessary-dynamic-linked-bar site: BCT Engineering --- # Planning in dynamic environment; linked bar chart Project Engineering · Chapter 3: Project Planning and Scheduling - Asked in: 2072 Kartik - Video: [Project Management in Under 5: What is a Gantt Chart?](https://www.youtube.com/watch?v=fB0wsdmV3Sw) — Online PM Courses - Mike Clayton - Answer checked by Claude Opus 5.5 (high effort) on 2026-10-14 - Page: https://www.bctengineer.com/q/semester_7/project_engineering/planning-necessary-dynamic-linked-bar - Whole chapter: https://www.bctengineer.com/md/semester_7/project_engineering/chapter-3 ## Question Why is project planning necessary to operate any project in a dynamic environment? Linked bar chart is one of the planning tools in project scheduling; justify this statement with a suitable example. Are there limitations of this chart? ## Short answer Planning in a dynamic environment anticipates changes in costs, resources, and conditions, enabling quick re-planning and deviation control. A linked bar chart shows activity durations and dependencies visually, aiding site understanding, but becomes cluttered with many activities and does not show float or uncertainty. ## Answer #### Need for planning in a dynamic environment A project works in an environment that keeps changing: prices of material and labour, exchange rates, government policy, weather, technology, availability of funds and the needs of the client. Without planning, the project would be run by guesswork. Planning is necessary because it: - forecasts the likely changes and prepares alternatives in advance; - sets objectives and a baseline so that deviations can be measured; - allocates scarce resources properly and avoids idle time and shortages; - coordinates many parties (client, consultant, contractor, suppliers); - allows quick re-planning when a change occurs, by updating the schedule and resources; - reduces risk, delay and cost overrun. #### Linked bar chart as a planning tool A **linked bar chart** is a bar chart in which the bars are joined by arrows (links) that show the dependence between activities: the finish of a predecessor is linked to the start of its successor. It therefore combines the simple view of a bar chart with the logic of a network. Example: a small building project (time in weeks). | Code | Activity | Duration (weeks) | Predecessor | |---|---|---|---| | A | Site clearing and layout | 1 | - | | B | Excavation | 2 | A | | C | Foundation (PCC and footing) | 3 | B | | D | Plinth beam and DPC | 2 | C | | E | Columns and brick walls | 5 | D | | F | Roof slab | 3 | E | | G | Plumbing and electrical conduits | 3 | E | | H | Plastering | 3 | F, G | | I | Flooring, doors and windows | 3 | H | | J | Painting and finishing | 2 | I | ```text 0 4 8 12 16 20 24 (wk) +------------------------ A Site clearing |#> B Excavation | ##> C Foundation | ###> D Plinth beam | ##> E Walls+columns | #####> F Roof slab | ###> G Plumb/electric| ###> H Plastering | ###> I Floor,doors | ###> J Painting | ## +------------------------ ``` Reading: the arrow `>` means the successor starts when the predecessor finishes. The project takes 24 weeks. Roof (F) and plumbing (G) run in parallel after walls (E), and plastering (H) waits for both. Since F and G have equal durations, no activity has any float, so all are critical: for example, a delay in E, F or G pushes H, I and J and the completion date. Justification: the chart is easy to prepare and read, shows the start, finish and duration of each activity, and its links show which activities control the others, so it is suitable for planning and for explaining the schedule to site staff. #### Limitations - Becomes crowded and unclear when the number of activities is large. - Does not clearly show the critical path or the float of each activity. - Does not show the uncertainty of durations (no probability). - Difficult to revise: a change needs redrawing. - Shows only simple finish-to-start dependence; resources and costs are not shown. ## Check yourself The answer's key points as multiple-choice questions, with the correct option and why. 1. Why is planning necessary in a dynamic environment? A. The environment never changes, so a fixed plan is enough B. Prices, policy, weather and funds keep changing, so planning forecasts changes and allows quick re-planning C. Planning stops all external changes D. Planning is needed only to impress the client Answer: B. Planning forecasts likely changes, sets a baseline to measure deviations and lets the schedule be updated when a change occurs. (Key point: Need for planning) 2. What makes a linked bar chart different from a simple bar chart? A. It shows the probability of each duration B. It shows only milestones C. Arrows join the finish of a predecessor to the start of its successor D. It shows costs on the vertical axis Answer: C. The links show dependence, combining bar chart simplicity with network logic. (Key point: Linked bar chart) 3. In the house example, plastering (H) waits for which activities? A. Both roof slab (F) and plumbing (G) B. Only roof slab (F) C. Only excavation (B) D. Painting (J) Answer: A. H has predecessors F and G, so a delay in either pushes H, I and J. (Key point: Example reading) 4. Which is a limitation of the linked bar chart? A. It cannot show start and finish dates B. It cannot show durations of activities C. It requires a computer to read D. It does not clearly show the critical path or float Answer: D. It becomes crowded, hides float and critical path, shows only finish-to-start logic and is hard to revise. (Key point: Limitations) ## Related in Project Engineering - [Planning need, tools, bar chart limitations](https://www.bctengineer.com/question.md?key=semester_7%2Fproject_engineering%3Aplanning-necessary-tools-bar-chart-limits) — Project Engineering, chapter 3 - [Planning, scheduling; linked bar chart](https://www.bctengineer.com/question.md?key=semester_7%2Fproject_engineering%3Aplanning-scheduling-linked-bar-chart) — Project Engineering, chapter 3 - [Planning tools, milestone chart, WBS](https://www.bctengineer.com/question.md?key=semester_7%2Fproject_engineering%3Aplanning-tools-milestone-wbs) — Project Engineering, chapter 3 - [Bar chart advantages and limitations](https://www.bctengineer.com/question.md?key=semester_7%2Fproject_engineering%3Abar-chart-advantages-limitations) — Project Engineering, chapter 3, asked 2× - [Project operates in a dynamic environment](https://www.bctengineer.com/question.md?key=semester_7%2Fproject_engineering%3Adynamic-environment-explain) — Project Engineering, chapter 1, asked 3× - [Scope of project engineering; dynamic environment](https://www.bctengineer.com/question.md?key=semester_7%2Fproject_engineering%3Ascope-project-engineering-dynamic-env) — Project Engineering, chapter 1 ## Related in other subjects - [Bar chart vs CPM/PERT as planning tool](https://www.bctengineer.com/question.md?key=semester_8%2Fconstruction_management%3Aplanning-tool-choice) — Construction Management, chapter 2, asked 3× - [CASE, CASE environment and CASE tools](https://www.bctengineer.com/question.md?key=semester_5%2Fsoftware_engineering%3Acase-environment) — Software Engineering, chapter 10 - [Planned maintenance, planning and scheduling](https://www.bctengineer.com/question.md?key=semester_8%2Fconstruction_management%3Aplanned-maintenance-scheduling) — Construction Management, chapter 9, asked 2×