HSC Together Year 12 Maths Standard: Forwards and Backwards Scanning

#### Maths Standard

• Simultaneous Linear Equations
• Non-linear Relationships
• Non-Right Angled Trigonometry
• Rates and Ratios
• Investments and Loans
• Annuities
• Bivariate Data Analysis
• The Normal Distribution
• Network Concepts
• Critical Path Analysis
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Back to other subjects

# Forwards and Backwards Scanning

In HSC Standard Math, we use forwards and backwards scanning to determine the earliest start time and latest start time for a project.

For a project, we always want it to be completed in the shortest time possible. In order to predict, we need to find out the Earliest Starting Time (EST), which indicates that a project cannot start until whatever unit of time is given after the start of the project. The process is called Forward Scanning.

Sometimes, we have some flexibility in the start time, so long as they occur before the Latest Start Time  (LST) to ensure the project is still completed in the shortest time possible. LST is calculated in reverse starting at the final activity working backwards. This process is called backward scanning.

### What is Forwards and Backwards Scanning?

The following video demonstrates how forwards and backwards scanning works in critical path analysis in order to determine the earliest start time and latest start time.

### Examples

The following videos complete exam-style questions to help you understand forwards and backwards scanning.

##### Part 2:

Want to learn more? Check out more of our HSC Standard Maths resources here!

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