slide 1 use case points. slide 2 use case points* use case points (ucp) is a current technique for...
DESCRIPTION
Slide 3 Use-Case Points l A size and effort estimation technique that was developed around use cases Better for OOSAD projects than function points l Requires at a minimum: The set of essential use cases The use case diagram All actors and use cases classified as simple, average, or complexTRANSCRIPT
Slide 1
Use Case Points
Slide 2
Use Case Points*
Use Case Points (UCP) is a current technique for measuring functionality of a software system.
It can be used for each use case or all use cases.
*Apparently also called “use case function points”, based on analogy to function point metric.
Slide 3
Use-Case Points
l A size and effort estimation technique that was developed around use cases• Better for OOSAD projects than function points
l Requires at a minimum:• The set of essential use cases• The use case diagram• All actors and use cases classified as simple, average,
or complex
Slide 4
Steps of UCP (Use Case Points) Estimation
1. Classify actors, to determine UAW (Unadjusted Actor weight)
2. Classify use case, to determine UUCW (Unadjusted Use case Weight)
3. Compute UUCP (Unadjusted Use Case Points)
4. Compute technical and environmental factors
5. Computer the Adjusted Use Case Points
6. Translate into an estimate of human effort
For each use case:
Slide 5
Steps in UCFP Estimation
1. Determine the UAW (Unadjusted Actor weight)
a. Using the Actor Classification Table determine the classification of each of the actors in the system.
b. Add the values of all the actors to determine the unadjusted actor weight of the system.
Slide 6
Classification Test to recognize classification Value/Factor
Simple Communicate to system through API. 1
AverageInteract with the system through some
protocol (HTTP, FTP, or probably some user defined protocol), or
Are data stores (Files, RDBMS).
2
Complex Interacts through HCI (GUI) 3
Actor Classification Table
Slide 7
2. Determine number of UUCW (Unadjusted Use case Weight)
1. Using the Use Case Classification Table, determine the classification of each use case on the use case diagram.
2. Add the values of each use case to yield the unadjusted use case weight.
Steps in UCFP Estimation
Slide 8
Use Case Classification Table
Use Case Type Test to recognize classification Value/Factor
Simple1-3 transactions
5
Average4-7 transactions
10
ComplexMore than 7 transactions
15
Slide 9
3. Determine Total UUCP (Unadjusted Use Case Points) using the formula below.
Total UUCP = Total UAW + Total UUCW.
Steps in UCFP Estimation
Slide 10
Technical Complexity Factors
Technical Complexity Factor (TCF) = 0.6 + (0.01 * TFactor)
Slide 11
Environmental Factors
Environmental Factor (EF) = 1.4 + (-0.03 * EFactor)
Slide 12
Person-Hours Multiplier
If the sum of (number of Efactors E1 through E6 assigned value < 3) and (number of Efactors E7 and E8 assigned value > 3) ≤ 2
PHM = 20Else If the sum of (number of Efactors E1 through E6
assigned value < 3) and (number of Efactors E7 and E8 assigned value > 3) = 3 or 4
PHM = 28Else
Rethink project; it has too high of a risk for failure
Slide 13
Computing Use-Case Points
l Adjusted Use Case Points (UCP) =l
UUCP * TCF * ECF
l Effort in Person Hours =l
UCP * PHM