Add feature selection documentation

This is a markdown document with introduction and an update of the CI
configuration.
Refs #13.

.gitlab-ci.yml

@@ -64,3 +64,19 @@ feature_definition:
       - tags
     changes:
       - features/*
+
+feature_selection:
+  stage: typeset
+    image: pandoc/latex:latest
+  script:
+    - pandoc feature_selection/selection.md $(ls feature_selection/*-iteration.md) -o feature_selection.pdf
+  artifacts:
+    paths:
+      - feature_selection.pdf
+  only:
+    refs:
+      - web
+      - branches
+      - tags
+    changes:
+      - feature_selection/*

feature_selection/selection.md

@@ -0,0 +1,46 @@
+# Feature selection procedure
+
+## Introduction
+The goal of this document is to record the decisions during the feature development.
+To make this document more readable the following section will explain the selection procedure.
+
+## Selection procedure
+There are three criteria that are applied in the selection procedure.
+These are: dependency, test coverage and risk/time analysis.
+Each criterion is a hard selection. We will only select on dependencies first.
+If any of the features have an equal amount of dependencies then we will look which one completes more tests.
+And the last is a risk/time analysis.
+
+### Dependency
+With the dependency criteria we count the number of other features each feature depends on.
+The feature with the highest number of dependencies will be implemented first.
+
+This is often a design dependency. For example, the engine in a car must be able to pull the weight of the car.
+Therefore, we need to know the weight of the car before we can design the engine.
+This can be a dependency, however we rather solve this by setting the specifications correctly.
+That the car itself has a maximum mass of something. Therefore, the engine has to be able to pull that maximum mass.
+Now we solved the dependency.
+
+However, at some point, we might have to test something before we can specify the mass of the complete car.
+In that case, a feature that can help us define the mass of the car better should get priority as other features depend on it.
+
+### Test coverage
+To see how the different systems work together we have designed multiple tests.
+Each test that can be resolved by implementing the feature gives us more information about the system.
+And if tests fail early, we can change the design earlier in the design.
+
+### Risk/Time procedure
+If we still have multiple features that have a draw in dependency and in test coverage we can assess the risk/time factor.
+We want to clear the most amount of risk per time period.
+In practice we will clear all the high risk features which have a short implementation time.
+And eventually we end up with low risk long implementation time.
+By moving al this risk forward we can clear more risk in an early stage of the development.
+
+The time and risk factor will be given _high_, _medium_, or _low_ as factor.
+Where _high_ = 3, _medium_ = 2, and _low_ = 1 point.
+We divide the risk points by the time points and note down the factor.
+The feature with the highest score will be implemented first.
+
+
+
+