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Project Lovelife Team has started gathering information necessary to develop a project network - predecessor activities and activity time in days. The results of their meeting are found below:

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Activity Description Duration Predecessor 2 Design 5 3 Procure prototype parts 10 2 Fabricate parts 15 2 5 Assemble prototype 5 3, 4 6 Laboratory test 7 5 Field test 15 6 8 Adjust design 6 9 Order stock components 10 8 10 Order custom components 5 8 11 Assemble test production unit 7 9, 10 12 Test unit 11 13 Document results 20 12