# Chapter 4: Computational Phase

## Introduction

The answer for "Is the system built right" (point 3 in [Figure 1](https://tno-data-science.gitbook.io/repro/chapter-1-overview-of-the-repro-method#introduction)), should be sought in its *-ilities*, quality demands on, e.g., maintainability, reusability, reliability, and more. These are the demands that are put on the system as a whole or pertain to particular characteristics that, in the end, relate to sustaining its value for the organization. Apart from the conceptual model that has been produced by the conceptual phase, in general one can state that it is more difficult to find documents that can be used as source for discovering the quality demands. In practice, it is more fruitful to start with a list of software qualities, e.g., [Zeist96](https://tno-data-science.gitbook.io/repro/closure/literature), and gather those that are considered relevant to the system and, subsequently, define their criteria.

{% hint style="warning" %}
Work in Progress - be patient, or ask one of the REPRO gang
{% endhint %}


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