PERT Calculation and Critical Path Analysis for System Building 2 Course, Lecture notes of Computers and Information technologies

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System Building 2

Lecture 23

Revision

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PERT

3 calculate the EET for all events

 To calculate the EET's (work from first to last)

EET of the first event = 0

Repeat the following for each event each of the other events

For each activity entering the event

Sum the activities duration and the EET of the activities start event

The EET is the highest value so obtained

Analyse 1 2 Dummy 0 Design 2 6 Dummy 0 Design 3 3 Dummy 0 Implement 4 2 Implement 3 1 Implement 2 2 Implement 1 1 12 11 1 0 2 2 3 6 4 8 5 5 6 6 7 12 8 12 9 15 12 15 13 21 1423 1015 0 Dummy Analyse 2 4 Analyse 3 2 Analyse 4 4 3 Design 1 0 Dummy1 0 Dummy 0 Dummy7 6 Design 4

PERT

4 Calculate the LET for all events

 To calculate the LET's (work from last to first)

LET of the last event = EET of the last event

Repeat the following for each of the other events

For each activity leaving the event

Subtract the activities duration from the LET of the activities end event

The LET is the lowest value so obtained

Note: The value for the LET of the first event should be 0

Analyse 1 2 Dummy 0 Design 2 6 Dummy 0 Design 3 3 Dummy 0 Implement 4 2 Implement 3 1 Implement 2 2 Implement 1 1 12 (^1113) 0 0 1 2 2 2 6 6 3 8 11 4 5 (^5 ) 6 (^6 ) 12 (^7 ) 12 (^8 ) 15 (^915) 15 20 12 21 21 13 23 23 14 15 (^1015) 0 Dummy Analyse 2 4 Analyse 3 2 Analyse 4 4 3 Design 1 0 Dummy1 0 Dummy 0 Dummy7 6 Design 4

Z You do not really need to know these ::= is defined as | or [ ] defined elsewhere delimiters ℕ the set of +ve ints ℕ 1 the set of +ve ints not zero ℙ power set (the set of all subsets of…) ¯ total bijective function (> ↠ ) ↠ total surjective function You may need to know these {} Set delimiters : introduces variable type ∩ set intersection  set union ’ after execution  Will (may) alter…  …is an element of… ↦ … maplet (instance of function)… ** set difference (subtraction) ’ after predicate instantiation Ξ will not alter… ? …is an input ! … is an output  …is not an element of … dom from the domain of…  …logical or…

Mat-Alan shoppers use wire baskets to carry purchase items. Q1 Given a basket’s id, write a predicate to remove an item (and the item’s id) or report ‘removal failed’. Q2 Given a basket’s id, write a predicate to report the content (id and item) or report ‘empty’.

The Example Exam Paper  Is unlike other papers  You are advised to:  Get a copy of the example case study  Study the example case study  Do a full analysis of the case study  Get a copy of the example exam paper  Answer the questions to the example exam  Attend revision lectures

The Example Exam Paper  Do a full analysis of the example case study  Use case, sequence, class and state  Design a user interface  (^) Try to spot questions and prepare answers  Answer the questions to the example exam  Under exam conditions  Time yourself  (^) Did you spot some questions

Revision (how to)  This will mainly be a practical exam with little chance to waffle!  Make sure you can do things  Make sure you know and use the correct symbols  You cannot learn this subject parrot fashion  (^) You must understand and apply your knowledge  Do not just do passive reading (your fantastic memory will be of little help)  (^) You will not be able to apply it

Revision (how to)  Test yourself under timed exam conditions  Practice the questions in the mock paper  It was designed to help you  It is very similar to the actual exam  (^) The case study is completely different  (^) Identical questions (in the mock and real exam) will usually produce very different answers  Attend the revision lectures and tutorials  Attend the tutorials armed with questions  (^) Do not ask what are the exam questions  Do a complete analysis of the real case study and question spot!