TY  - JOUR
T1  - A Model Combining a Priori and Posteriori Contexts to Estimate the Costs of a
Software Project
AU - Abu-Faraj, Mua`ad AU - Al-Sarayreh, Khalid T. AU - Meridji, Kenza 
JO  - Journal of Engineering and Applied Sciences
VL  - 14
IS  - 11
SP  - 3643
EP  - 3650
PY  - 2019
DA  - 2001/08/19
SN  - 1816-949x
DO  - jeasci.2019.3643.3650
UR  - https://makhillpublications.co/view-article.php?doi=jeasci.2019.3643.3650
KW  - cost estimation models
KW  -informal opinions
KW  -organization
KW  -software
KW  -A priori context
KW  -a posteriori context
KW  -cost estimation models
KW  -informal opinions
KW  -organization
KW  -software
AB  - An early cost estimation model is one of the important issues in software engineering projects. It has
been observed that cost estimation software projects often differ from the final costs. This study presents a proposed
model combining between a priori and posteriori contexts for early estimation of the cost in order to avoid the used
confusion of these two estimations concepts. This research contributes to research knowledge by proposing and
validating most of the common cost estimation models used throughout the a priori and posteriori contexts and it
highlights some of the confusion of such estimation models uses in software engineering development projects. In
addition, this study lists some of the estimation techniques that can be used in a priori and posteriori contexts. The
proposed model in this study can be used to help organizations to deliver their projects on time and with estimated
budget in a context of fixed-price agreements. Therefore, organizations must conclude well in advance such
estimates which are called the a priori cost estimation. Whilst these organizations typically use estimation
techniques based either on informal opinions or organizational experience or on a posteriori estimation models
developed internally or developed by outside consultancy.
ER  -