Abstract
The adequate consideration of resource interactions among IS projects is a challenging but important requirement within IS project portfolio selection. However, the literature does not mention any potential techniques for the identification and assessment of resource interactions. Moreover, the literature has so far neglected the question of the trade-off between time and effort invested in identifying and evaluating resource interactions caused by resource sharing among projects, compared to the benefits derived from this procedure. Hence, the paper’s contribution is twofold. First, a technique to support the identification and evaluation of potentially economically relevant resource interactions is suggested. Second, the paper proposes a decision model that allows to calculate a theoretical upper bound for the amount of effort that should be invested in improving estimates for identified interactions as part of the portfolio planning process.
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Notes
In line with, e.g., Eilat et al. (2006) we use the term interaction synonymously to interdependency in this article.
Alternatively to the fixed cost parameters introduced above, it is also possible to formulate parametric functions that represent the marginal cost decrease or increase for additional resource units.
The optimization model is part of a prototypically implemented decision support software; in the following referred to as system.
For instance, the average number of projects in R&D and IT project portfolios in large and mid-sized firms, according to a cross industry study of Meskendahl et al. (2011), is 132. Obviously, the number of project proposals will typically be even much higher.
To calculate PF, we assume that all input parameters necessary for our quadratically-constrained 0–1 program are known with certainty.
Relaxing the contingency restrictions from the example of Lee and Kim (2001) enabled us to better illustrate the functionalities of our approach.
Referring to the example in the introduction of Sect. 3.2.2, for 20 projects, five resources and only up to three projects (k = 3) per interaction, the potential number of interactions would be reduced from over 5 m to 6650.
Please note that we have limited the number of projects participating in an interaction to k = 3 projects per interaction to keep the example comprehensible.
We assume that existing resources generate fixed costs, even if they are not used to full capacity (e.g., personnel). If this assumption is relaxed, we have to introduce penalty costs to estimate the residual value of the reduced portfolio PF red i,s accordingly.
For a triangular distribution, for example, the mode is set to the point estimate provided by the expert, while the upper and lower bounds derived by expert estimation provide the minimum and maximum values for the distribution, respectively. The probabilities for the occurrence of each realization s can then be calculated and serve as weights for the corresponding benefit differences d i,s . To calculate the probabilities for each individual s, the interval between the bounds has to be discretized into a number of subintervals. For each subinterval, its expected value serves as the realization of the interaction under investigation for the corresponding optimization step. The area defined by the interval and the triangle defining the distribution then serves as probability for the occurrence of this realization.
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Accepted after three revisions by Prof. Dr. Bichler.
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Meier, C., Kundisch, D. & Willeke, J. Is it Worth the Effort?. Bus Inf Syst Eng 59, 81–95 (2017). https://doi.org/10.1007/s12599-016-0450-4
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DOI: https://doi.org/10.1007/s12599-016-0450-4