Advanced Work
Advanced tasks are those activities which make the subsequent current work more effective. By doing the advanced tasks, the organization can learn the new set of up-front tools and gain experience with it. This is not a trivial matter because the resources available to do the work are limited and advanced work has less priority than current work.
The Advanced Work Sector contains two stocks. "Advanced Tasks Not Completed" represents those tasks introduced, but have yet to be completed. When the tasks are completed they go into the stock of "Advanced Tasks Completed".
(020) Advanced Tasks Introduced= IF THEN ELSE(Months to Introduction Date=12,New Advanced Tasks Per Yr/TIME STEP,0)
Units: tasks/Month
Advanced Task Introducded Into Development. When there are 12 months to job one, New Advanced Tasks Per Year is pulsed in.
(022) Advanced Tasks Not Completed= INTEG (+Advanced Tasks Introduced-Advanced Not Completed Flushed-Advanced Task Completion Rate,0)
Units: tasks
Advanced Development Tasks that have yet to be completed. When months to job one equals 12, new tasks are introduced all at once and what is still left of the stock is emptied to reset for another model year.
(016) Advanced Task Completion Rate= IF THEN ELSE(Months to Introduction Date=12,0,Actual Advanced Task Completion Rate)
Units: tasks/Month
This is the rate of Advanced Tasks being completed. This rate depends on the Actual Advanced Completion Rate calculated in the Capacity Allocation Sector. The if-then-else formulation is used to turn off the flow at the instant of the cycle's end.
(018) Advanced Tasks Completed= INTEG (Advanced Task Completion Rate-Advanced Completed Flushed, New Advanced Tasks Per Yr)
Units: tasks
Advanced Tasks Completed accumulates when advanced tasks are completed. This stock is flushed at the time of launch to reset for another model year cycle.
The advanced tasks are introduced at the beginning of each year according to the rate of Advanced Tasks Introduced. The "New Advanced Tasks Per Year" is the corresponding advanced work of the New Changes Per Year according to the Current Advanced Ratio, and is also dependent on the introduction of new tools. Here, if more up-front tools are introduced then there are more advanced tasks that must be done.
(125) New Advanced Tasks Per Yr= New Changes per Yr/Current Advanced Ratio* Frac Advanced Tasks Under Current Method
Units: tasks
The New Advanced Tasks introduced Per Year is the fraction of the New Changes to be introduced in the Current Work according to the Current Advanced Ratio, and is also dependent on the introduction of Methodology.
(048) Current Advanced Ratio=2
Units: dimensionless
The Current Advanced Ratio is the fraction of current tasks compared to advanced tasks.
The Advanced Task Completion Rate depends on the resources that are allocated in the Capacity Allocation Sector. This rate varies according to the resources available for advanced tasks.
At the end of each model year cycle, the stocks of advanced tasks are emptied and the amount of advanced tasks completed is noted in a memory stock, "Advanced Tasks Completed Last Year", used in the Current Defects Sector. Note that the fraction of advanced tasks completed is the critical dependence among model years.
(084) Fraction of Advanced Task Completed this Model Year= ZIDZ(Advanced Tasks Completed,Advanced Tasks Completed+Advanced Tasks Not Completed)
Units: dimensionless
This is the Fraction of Advanced Tasks Completed this Model Year. This value shows the instantaneous fraction completed in time.
(012) Advanced Completed Flushed = IF THEN ELSE(Months to Introduction Date=12,Advanced Tasks Completed/TIME STEP,0)
Units: tasks/Month
Advanced Tasks Completed is pulsed out at the end of the model year. A memory stock, "Adv Task Comp Last Yr", is used to keep track of the advanced tasks completed the previous year.
(014) Advanced Not Completed Flushed = IF THEN ELSE(Months to Introduction Date=12,Advanced Tasks Not Completed/TIME STEP,0)
Units: tasks/Month
The stock of Advanced Tasks yet to be Completed is flushed out when month to job one equals 12.
Up-front Tools
The "Fraction of Advanced Tasks Under Current Method" is the total fraction of the tool set introduced into the simulation. It is computed by summing the base fraction, 0.25 and the step function of the additional tool set introduced.
(074) Frac Advanced Tasks Under Current Method=0.25+step(Additional Fraction of Methodology Introduced, Methodology Intro Date)
Units: dimensionless
The Fraction of Advanced Tasks Under Current Method is the total fraction of the methodology introduced into the simulation. It is computed by summing the base fraction, 0.25 and the step function of the additional methodology introduced.
(007) Additional Fraction of Methodology Introduced= 0
Units: dimensionless
The Additional Fraction of Methodology Introduced is the additional percentage of Methodology introduced into the advanced work. This represents the percent of the total tool set available to the organization. Here, keep in mind the base methodology introduced is 0.25. The introduction of a new set of tools means that the set of up-front activities is increased. The cost of introducing new tools is captured by the fact that the up-front activities require more resources.
The introduction of additional tools means that the set of up-front activities is increased. The cost of introducing new tools is captured by the fact that more resources are required for advanced work.
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