Download presentation

Presentation is loading. Please wait.

Published byCornelius Mathews Modified about 1 year ago

1
UNCLASSIFIED Activity and Cost Analysis of a Scheduling Problem Terry Weir Joint Operations Division

2
UNCLASSIFIED Outline Introduction Background Problem Data Regression Analysis Simulations Summary

3
UNCLASSIFIED Introduction A sample of previous activity and costing studies TopicThemeClientReport RAN Fleet Aviation Management Study 1999Rate of Effort CostsRANNAFMR Collins Class Cost of OwnershipSustainmentCOLSPODSTO-TR-2131 Collins Class Activity AnalysisReadinessCDGDSTO-CR Parameterisation of the ASW MissionOperational PlanningALGDSTO-TR-2413 Preparedness Modelling and Analysis Tool - Phase 1Preparedness ManagementDGDPREPDSTO-TR Fleet Costing Study 2000Fleet Options CostingFASRFP Quantifying Current Aggregate Sea Training Requirements of the Fleet 2010Collective TrainingFHQ KPMG PAL Review (ANZAC Detailed Force Element Review) 2009Preparedness ManagementDGDPREP Productivity Measurement in the Royal Australian Navy: A Preliminary Analysis (CEPA)Productivity ManagementSCFEG A Statistical Activity Cost Analysis of a Fleet Scheduling Problem 2010Fleet Activity CostingNHQ Engineering Asset Management and Infrastructure Sustainability

4
UNCLASSIFIED References Cooper, R., (1988) The rise of activity-based costing – part one: what is an activity- based cost system? Journal of Cost Management, 2, Noreen, E., (1991) Conditions under which activity-based cost systems provide relevant costs, J. Man. Acc. Res, Fall, Willett, R.J. (1987). An axiomatic theory of accounting measurement. Acc. Bus. Res., 17, 155–171 Willett, R.J. (1988). An axiomatic theory of accounting measurement—part II. Acc. Bus. Res., 19, 79–91 Colin, A., Lambrineas, P., Weir, T. and Willet, R.J. (2011) Statistical Activity Cost Regression Analysis of a Scheduling Problem, in J. Mathew et al. (eds.), Engineering Asset Management and Infrastructure Sustainability, pp , Springer-Verlag London Limited Amadi-Echendu, J., Willett, R. J., Brown, K., Matthew, J., Vyas, N. and Yang, B-S. (2010) What Is Engineering Asset Management? In Amadi-Eschendu et al. (eds) Engineering Asset Management Review 1, Definitions, concepts and scope of engineering asset management pp 3-16, Springer-Verlag London Limited.

5
UNCLASSIFIED Background to this study Traditional cost accounting Costs allocated to products based on volume of product or output Simple to use Little computing power needed Activity based costing (see eg Cooper 1988) Activities generate costs Two stage allocation –Activities –Products or outputs Greater segmentation of costs & fidelity Higher computation requirements Questions over appropriateness of activities Conditions for accuracy and cost separation are very strong (Noreen 1991) Both methods suffer from arbitrary allocations and assume recorded costs are deterministic

6
UNCLASSIFIED Statistical Activity Cost Analysis (Willett 1987, 1988) Axiomatic model addresses: –Transaction costs –Continuity of production relations –Separability of production relations Background C t Activity Costs time tt -1 a0a0 a2a2 a1a1 Asset at t-1 Equity at t Asset at t Asset at t-1 Asset at t Can recover all accounting arithmetic Costs are random variables Application to earnings, depreciation and goodwill Application to reliability analysis, portfolio budgeting and scheduling R. Willet 2004

7
UNCLASSIFIED Problem – can we relate Navy fleet activities to costs A key question in Defence planning is “how much does it cost to conduct an exercise, event or activity?” Our question is can the cost of activities be estimated, based on a knowledge of past activity levels? If we can do this this we can use this to better estimate costs for budgeting, risk analysis etc By product : better preparedness management Typical costing approaches tend to be subjective and deterministic. We aim for a statistical approach.

8
UNCLASSIFIED Data Navy Activities FAMT provides data for the ‘activity’ dimension Fleet activities generate Navy outputs Activity data can be described by multiple parameters: duration, type, location, operation….

9
UNCLASSIFIED Data Costs Data sourced from Defence ERP systems ROMAN, JFL, SDSS/MILIS, COMSARM, PMKEYS, ADFPAY, CENRESPAY Consolidated in Navy’s Activity Based Management System Costs categorised by ship class and expense type Costs aggregated by quarter

10
UNCLASSIFIED Sample Data 4 platforms, P1..P4, same class, 6 cost categories, direct costs only, 26 quarters Proportional Standard Deviations Personnel0.02 Maintenance0.04 Fuel0.02 Expenses0.02 Inventory0.08 Ordnance0.04 Average cost per quarter $7.59m Standard deviation per quarter $1.39m

11
UNCLASSIFIED Observed correlations Average correlations between cost categories TotalFuelExpensesInventoryOrdnancePersonnelMaintenance Total1.00 Fuel Expenses Inventory Ordnance Personnel Maintenance Cost M I ? E F P O ?

12
UNCLASSIFIED Regression When durations of events are included: No simple contemporaneous relationship between costs and events in current time periods But if lags are considered, a systematic pattern emerges Simple model: Y i,t are the costs in each category A i,t are the away from home port times i are the fixed costs i,t are prices of variable away times Current costs depend on past activities! This is not what is expected from ABC!

13
UNCLASSIFIED Forecast power Fuel, expenses, personnel and maintenance costs have significant two period lags Ordnance and inventory costs have lags of either one or three periods The strengths of the lags is surprising. We would expect contemporaneous associations between cost changes and underlying activities Possible explanations: Activities are related over time causing costs to be incurred eg maintenance and operational schedules – future maintenance costs depends on past activities Accounting systems produce lags because of invoice processing etc

14
UNCLASSIFIED Forecast power More advanced model Costs as a function of alongside time, at sea time, maintenance time Again statistically significant lagged relationships But the improvement is not remarkable Simply adding more data does not necessarily improve forecast power

15
UNCLASSIFIED Simulations SACA is based upon the objective of providing an improved description of the relationships between physical processes and financial measurements. In this it is similar to activity based costing. SACA integrates statistical theory into the analysis of these relationships. If alternate attributes such as capability or risk measures can be related to physical tasks, then we can model the interaction of costs, capability and risk

16
UNCLASSIFIED Example Simple Simulation We assume ‘Capability’ is a decaying function of time from last major maintenance. Capability is refreshed in maintenance The simulator generates events Maintenance periods are quarterly or biannual Platform activities are uniformly distributed over a six month period beginning with the start of maintenance The duration of maintenance periods are randomly generated from a beta distribution Platform activities arrive randomly conditional upon their planned maintenance; non-zero probabilities of multiple platforms in maintenance simultaneously Costs are generated using the away times generated by the maintenance schedules Overall fleet capability is measured on a daily basis by averaging individual daily capability Ships P1 P2 P3 P4 Simulated Maintenance and Away Periods Time Beta Distribution

17
UNCLASSIFIED Example Sample Simulation

18
UNCLASSIFIED Summary & Conclusions Good results exhibit potential to use SACA in modelling cost and activity data The model demonstrated here has a fixed and variable component. Better understanding of ‘cost drivers’ will enable models to eliminate lags as much as possible Capability and capacity metrics can be utilised in simulations based on SACA Automation of data capture etc should allow for decision support tools Direct applicability to cost generation in FAMT

Similar presentations

© 2017 SlidePlayer.com Inc.

All rights reserved.

Ads by Google