← VCE Software Development U4O2

External development: advantages

Hiring an outside developer gives specialist skills and extra capacity, often with faster delivery and a fixed contract cost, without hiring permanent staff.

Part of: VCE Software Development - U4O2 - Cyber Security: secure software development practices — Module 6

Understanding External development: advantages in VCE Software Development U4O2

What it does: The code checks for a missing skill and then brings in an external specialist, which is the specialist skills advantage. As the number of developers increases, the weeks needed fall, showing how extra external capacity speeds up delivery. A key advantage is scalable capacity: the organisation can bring in people for the project and does not need permanent hires. A contract can set a fixed price or agreed rates, so the organisation can budget with more certainty. Outside developers who specialise in an area bring skills and experience that an in-house team may lack. The broken code gets the advantage wrong. The correct code is cost <- contract_price.

Common mistakes: An external developer is hired to fill a specialist skill gap the in-house team does not have. The condition should be 'if need not in skills:'. A fixed-price contract is what makes the cost predictable. An open-ended contract has no agreed limit, so it should be 'fixed_price'.

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Learning
Duo
A small business needs a one-off mobile app but has no developers who know mobile security. Which advantage of external development fits best?
Access to specialist skills the business does not have in-houseFull control over every developer's daily work and training
Matches
cost <- unknown // external contract
↓
A contract sets an agreed price, so external development gives a predictable cost. The cost is not unknown.
Applying
Meanings
Term
External development advantages
Meaning
Hiring an outside developer gives specialist skills and extra capacity, often with faster delivery and a fixed contract cost, without hiring permanent staff.
Practice
IF team_lacks_skill = true THEN
Testing
Gaps
IF skillsGap = TRUE
Check Answer
Spots
2need = 'encryption'
3if need in skills:

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Quick Questions

1. A small business needs a one-off mobile app but has no developers who know mobile security. Which advantage of external development fits best?
A. Access to specialist skills the business does not have in-house ✓
B. Full control over every developer's daily work and training
External developers can bring specialist skills, such as mobile app security, without the business hiring and training permanent staff.
2. Which statement about external development is TRUE?
A. The organisation can add extra capacity for a project without hiring permanent staff ✓
B. The organisation must hire permanent staff before any work can start
A key advantage is scalable capacity: the organisation can bring in people for the project and does not need permanent hires.
3. A company must launch a product before a deadline. Why might an external developer help?
A. External developers always take longer, so the deadline is safer
B. A dedicated team can start quickly and deliver faster ✓
External teams can often start straight away and add extra people, which supports faster delivery. It is not guaranteed, but it is a common advantage.
4. Which describes the cost advantage of an external developer working under a contract?
A. The price can be agreed up front, so cost is more predictable ✓
B. The cost is always unknown until the project is finished
A contract can set a fixed price or agreed rates, so the organisation can budget with more certainty.
5. Which cost is the organisation more likely to AVOID by using an external developer?
A. The cost of writing a contract
B. Salaries, leave and training for permanent developers ✓
With external development, the organisation avoids ongoing permanent staff costs such as salaries, leave entitlements and training. It does still need a contract.

Match the Pairs

contract_price = 50000 → Predictable cost: the organisation knows the total price in advance because it is fixed in the contract.
developers = 4 + 3 → Scalable capacity: the organisation adds extra developers for a project without hiring permanent staff.
Specialist skills: an outside firm can supply expertise the organisation does not have in-house → IF skill_in_house = FALSE THEN hire_external_specialist
Faster delivery: more developers working in parallel can finish the project sooner → weeks <- total_work / developers
cost <- unknown // external contract → A contract sets an agreed price, so external development gives a predictable cost. The cost is not unknown.
permanent_staff <- permanent_staff + 5 → The advantage is extra capacity without hiring permanent staff. Hiring five permanent staff is in-house, not external.

Key Term

External development advantages
Hiring an outside developer gives specialist skills and extra capacity, often with faster delivery and a fixed contract cost, without hiring permanent staff.

Fill in the Blanks

1. IF skillsGap = TRUE THEN hire(externalDeveloper) END IF
Hint: Type the keyword that follows the condition and starts the block that runs when a specialist skills gap exists.
2. capacity ← teamSize + extraDevelopers
Hint: Type the operator that adds contracted developers to the current team so capacity scales up.
3. deliveryDays ← inHouseDays - daysSaved
Hint: Type the operator that reduces the delivery time because the external team works faster.
4. fixedPrice ← 20000 totalCost ← fixedPrice OUTPUT totalCost
Hint: Type the variable that holds the agreed contract amount, so the final cost is predictable.
5. WHILE workload > teamCapacity addDeveloper() END WHILE
Hint: Type the loop keyword that keeps adding contracted developers for as long as the workload is bigger than capacity.

Spot the Error

Question 1
A skills = ['web', 'testing']
B need = 'encryption'
C if need in skills:
D hire = 'external'
Line C — An external developer is hired to fill a specialist skill gap the in-house team does not have. The condition should be 'if need not in skills:'.
Question 2
A contract_type = 'open_ended'
B agreed_cost = 20000
C client_pays = agreed_cost
Line A — A fixed-price contract is what makes the cost predictable. An open-ended contract has no agreed limit, so it should be 'fixed_price'.
Question 3
A cap = staff_hrs - ext_hrs
B if cap >= project_hrs:
C print('On track')
Line A — External developers add extra capacity to the team's hours. Capacity should be staff_hrs + ext_hrs, not a subtraction.
Question 4
A in_wks = 12
B ext_wks = 8
C faster = ext_wks > in_wks
D print(faster)
Line C — External delivery is faster when it takes fewer weeks than in-house delivery. The comparison should be ext_wks < in_wks.
Question 5
A specialist = 'cryptography'
B in_house_has = False
C if not in_house_has:
D hire_permanent(specialist)
Line D — The advantage is getting specialist skills without hiring permanent staff. It should call hire_external(specialist), not hire_permanent.

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