Latest Event Time

Latest Event Time (Let) The last event (let-datest event time) or the most recent time is the last time an event can occur, and it is impossible to occur afterwards. The benefits of the determination of the last time (let) an event is to find out the last time or at the latest starts to carry out activities that come from the events concerned. Where: Eeti = (Earliest Event Time) The fastest time starts from event I Leti = (Latest Event Time) The time starts at the latest from event I DIJ = Duration to carry out activities between event I and event j EETj = (earliest event time) The time starts at the fastest event j LETj = (later event time) time starts at the latest from event j a. Let's calculation Let (Latest Event Time) is the most starting time of the project. Calculation of Letting Value Used backward analysis, starting with the latest activities and continued with the previous activity. Resignation calculations to calculate the Latest Event Time (Let) can be done with the formula: LETi = (LETj – dij) min Where: LETi = (Latest Event Time) The time starts at the latest from Event I LETj = (Latest Event Time) time starts no later than event j dIJ = Duration to carry out activities between event I and event j The following is a procedure for calculating the time starting at the latest (let): • Perform the procedure for calculating the fastest starting time (eet) • Determine the LETi value equal to the EETj value in the maximum number (far right) event • Furthermore, it can be calculated that the Value of the previous events with the formula above. If there are several activities (including dummy) are limited by the same event, then the minimum SEAS value is taken. b. Sample letting calculation Activity Name Previous Code Activity Time (Minggu) Make specifications and designs A - 6 Generator factory B A 2 Buy foundation material C A 1 Recruit operators D B 4 Trials E C 2 Make the foundation F B 4 Train operators and mechanics G D,E 2 Generator Transportation H C 1 Table 2. List of Project Activities 1 1) The first step, perform the procedure for calculating the fastest time (EET) EET calculation can be described as follows. Figure 4. Eet calculation • Eet1 = 0 (Project Starting Time) • Eet2 = Eet1+Duration A = 0+6 = 6 • Eet3 = Eet2+Duration B = 6+2 = 8 • Eet4 = eet2+duration C = 6+1 = 7 • Eet5 = eet3+duration d = 8+4 = 12 = Eet4+duration e = 7+2 = 9 To determine EET5, the maximum EET value is used, 12. • Eet6 = eet3+duration f = 8+4 = 12 = Eet5+duration g = 12+2 = 14 = Eet4+duration h = 7+1 = 8 To determine EET 6, the maximum EET value is used, which is 14. 2) The second step, determine the value of the Letj is equal to the EETJ value in the maximum number (rightmost) event. From the previous calculation, the maximum EETJ value obtained was 14. Because the value of letj = EETJ value, then Letj = 14. 3) The third step, perform the procedure for calculating the time starting at the latest (let) Figure 5. Calculation of Let 1 • Let6 = Let6 = 14 • Let5 = Let6 - D5-6 = 14 - 2 = 12 • Let4 = Let5 - D4-5 = 12 - 2 = 10 • Let3 = Let4 - D3-5 = 12 - 4 = 8 • To determine let2, because it has several activities that are limited by the same event, the calculation is taken from the minimum SETI value. In this case, Let3 Let4, then the minimum Letting value is used, which is 8: Let2 = Let3-D2-3 = 8-2 = 6 Let1 = Let2 - D1-2 = 6 - 6 = 0