---
title: "Bar chart vs CPM/PERT as planning tool"
subject: "Construction Management"
chapter: 2
key: "semester_8/construction_management:planning-tool-choice"
source: https://www.bctengineer.com/q/semester_8/construction_management/planning-tool-choice
site: BCT Engineering
---

# Bar chart vs CPM/PERT as planning tool

Construction Management · Chapter 2: Construction Planning and Scheduling

- Asked in: 2070 Magh, 2 marks; 2069 Bhadra (old course), 8 marks; 2065 Baisakh (old course) (asked 3 times)
- Video: [Introduction to Bar Charts - Construction Project Planning and Scheduling - Construction Management](https://www.youtube.com/watch?v=KqFO2-2Guns) — Ekeeda
- Answer checked by Claude Opus 5.5 (high effort) on 2026-10-14
- Page: https://www.bctengineer.com/q/semester_8/construction_management/planning-tool-choice
- Whole chapter: https://www.bctengineer.com/md/semester_8/construction_management/chapter-2

## Question

Among CPM, PERT and bar chart, which planning tool do you prefer for building construction? Explain why (why do you prefer the bar chart as a planning tool?).

## Short answer

Bar (Gantt) chart, supported by CPM for large projects. It is easy to prepare and understand by site engineers, foremen and clients, progress can be marked directly, it links to resource and material schedules, and it is cheap to create. Standard building durations make PERT’s probabilistic estimates unnecessary.

## Answer

**Preferred tool for building construction: the bar (Gantt) chart**, supported by CPM for complex or large projects.

#### Comparison
| Point | Bar chart | CPM | PERT |
|---|---|---|---|
| Basis | Activities against time scale | Network, deterministic times | Network, probabilistic times |
| Ease | Very easy to prepare and read | Moderate | Complex |
| Dependency shown | Weak | Clear | Clear |
| Critical path / float | Not shown directly | Shown | Shown |
| Best for | Simple, repetitive jobs | Construction with known times | R&D, uncertain tasks |
| Updating | Easy | Needs recalculation | Needs recalculation |

#### Why the bar chart for buildings
1. Building works use well-known activities and standard durations, so PERT's three-time estimates are unnecessary.
2. Site engineers, foremen and the client understand it readily, so it works as a communication tool at the site.
3. Progress can be marked directly (planned vs actual) with little effort.
4. It can be linked to resource and material schedules, and cash flow.
5. It is cheap and quick to prepare without software.
6. Its limitation (no dependency shown) can be removed by linked bar charts or by a CPM network behind it for large buildings.

For a small or medium building a bar chart is enough; for a high-rise or a large complex a CPM network with a bar chart output is best.

## Check yourself

The answer's key points as multiple-choice questions, with the correct option and why.

1. Which tool is preferred for building construction?
   A. PERT
   B. Bar chart, with CPM for large projects
   C. CPM only
   D. None
   Answer: B. The bar chart suits buildings, supported by CPM for complex ones. (Key point: Preferred tool)

2. Why is PERT unnecessary for buildings?
   A. Building activities are well known with standard durations
   B. It is too cheap
   C. It shows float
   D. It cannot show dependency
   Answer: A. PERT's probabilistic estimates are for uncertain tasks like R&D. (Key point: Why not PERT)

3. What is the bar chart's weakness and remedy?
   A. It shows float; remove it
   B. Weak dependency display; use linked bars or a CPM network behind it
   C. It is costly; use PERT
   D. It cannot show progress
   Answer: B. Dependency is weak, remedied by linked bar charts or CPM. (Key point: Limitation)

4. Why is the bar chart good on site?
   A. Foremen and clients easily understand it and progress is marked directly
   B. It needs software
   C. It shows the critical path
   D. It is complex
   Answer: A. It is easy to read and update at site. (Key point: Communication)

## Related in Construction Management

- [Regulatory requirements and building codes for planning](https://www.bctengineer.com/question.md?key=semester_8%2Fconstruction_management%3Aregulatory-building-codes-urban) — Construction Management, chapter 11, asked 2×
- [EVA numerical with bar schedule (A to F)](https://www.bctengineer.com/question.md?key=semester_8%2Fconstruction_management%3Aeva-numerical-2078-kartik) — Construction Management, chapter 7
- [TCTO numerical with time-cost chart (five activities)](https://www.bctengineer.com/question.md?key=semester_8%2Fconstruction_management%3Atcto-2079-jestha) — Construction Management, chapter 2
- [Loan value against mortgage of a building](https://www.bctengineer.com/question.md?key=semester_8%2Fconstruction_management%3Avalue-building-mortgage-loan-2073) — Construction Management, chapter 13
- [Client role in pre-tender stage planning](https://www.bctengineer.com/question.md?key=semester_8%2Fconstruction_management%3Aclient-pretender-planning) — Construction Management, chapter 2, asked 2×
- [ABC classification and inventory planning](https://www.bctengineer.com/question.md?key=semester_8%2Fconstruction_management%3Aabc-inventory-planning-repetitive) — Construction Management, chapter 3, asked 2×

## Related in other subjects

- [When to use bar chart, CPM, PERT](https://www.bctengineer.com/question.md?key=semester_7%2Fproject_engineering%3Abar-chart-cpm-pert-situations) — 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 in dynamic environment; linked bar chart](https://www.bctengineer.com/question.md?key=semester_7%2Fproject_engineering%3Aplanning-necessary-dynamic-linked-bar) — Project Engineering, chapter 3
- [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