Bar (Gantt) charts in project control: Which of the following is an incorrect statement about Bar Charts used for planning and monitoring construction activities?

Introduction / Context:
Bar Charts (Gantt charts) are widely used for planning and progress reporting because they are simple and visually intuitive. However, they have limitations compared to network methods like CPM/PERT, especially in showing logical dependencies.

Given Data / Assumptions:

• Standard bar chart with activities plotted against time.
• No embedded network logic unless separately annotated.
• Construction project with multiple interdependent tasks.

Concept / Approach:
Bar charts show duration and timing but not the full precedence network. Without additional notations (like arrows/links), they cannot reliably represent the interdependency of activities and events. Hence any statement claiming that bar charts inherently establish interdependency is incorrect.

Step-by-Step Solution:
Evaluate Option A: A single bar per activity is the standard representation, so this is correct.Evaluate Option B: Claiming that bar charts establish interdependency is incorrect because pure Gantt formats lack explicit logical relationships.Evaluate Option C: Simple bar charts are commonly used to show approximate completion percentages, which is acceptable.Therefore, Option B is the incorrect statement.

Verification / Alternative check:
Network diagrams (CPM/PERT) explicitly include nodes and links to show dependencies and critical paths; bar charts require extra linkage or a separate network to convey the same information.

Why Other Options Are Wrong:

• Option A: Accurately describes Gantt chart representation.
• Option C: Reflects typical practice of percent-complete reporting.
• Option D: 'None of these' is wrong because one statement is indeed incorrect.
• Option E: Bar charts are effective communication tools; this is true, but not central to the question.

Common Pitfalls:
Confusing annotated Gantt charts (with precedence links) with basic bar charts; assuming visibility of float and criticality on bar charts without network analysis.

Final Answer:
Bar charts establish the interdependency (logical precedence) of one event/activity on another.