Creating decision tree for reliability rankings

Create, view, or modify a decision tree for a reliability ranking to calculate a reliability ranking score. A decision tree is comprised of four levels which include a reliability ranking level and up to three sub-levels, answers, formulas, and normalization values.

Note: All levels must be used. Different branches in the tree may use varying numbers of levels.

To create decision tree for reliability rankings:

  1. Open the Reliability Ranking form.
  2. Select the reliability ranking for which to create a decision tree, and then click the Decision Tree tab.

Adding levels

Add levels to the decision tree to create a structure for calculating reliability rankings.

A level can be a node in the tree where a formula is executed or it can be a question. A question always means the lowest level in the tree has been reached. If the level is a question, one or more answers must be supplied for the question level. Levels that are not questions may have child levels.

To add levels:

  1. On the Decision Tree tab, expand the tree, select the level for which to add to, and then click Add Level.
  2. Level—Enter the unique code identifying the level, and then enter a description in the adjacent field.
  3. Question Level—Select to indicate the level is a question with which an answer will be associated.
  4. Question—Enter the question the system will ask if this level is a question level.
  5. Click Submit.
    Note: To translate the selected level description and/or question, select the level, and then click Translations or Question Translations. The system opens the Translations popup. Select the language record, enter the Translated Description, and then select Translated.

Adding answers

Add answers to a selected question level in the decision tree to create a structure for calculating reliability rankings.

To add answers:

  1. On the Decision Tree tab, select a question level, and then click Add/Edit Answers.
  2. Click Add Answer.
  3. Answer—Enter a unique code identifying the answer, and then enter the answer in the adjacent field.
    Note: Enter as many answers as necessary for a selected Question Level.
  4. Value—Enter the value for the answer.
    Note: The system will use this value in the formula to determine the Reliability Ranking Score.
  5. Click Submit.
    Note: To translate the selected answer description, select the answer, and then click Translations. Select the language record, enter the Translated Description, and then select Translated.

Adding formulas

Add, edit, or delete a formula for a selected non-Question level.

Note: The system does not allow formula associations to question levels.

To add formulas:

  1. On the Decision Tree tab, select a non-question level for which to add a formula, and then click Add/Edit Formula. The system automatically populates Level and the level description of all the children.
  2. Formula—Enter the formula. Use the child levels in the formula by adding a colon ":" in front of the level code. The formula also supports any SQL numeric functions.
    Example: Where the score for the level is determined by the average of the environmental level and 2 times the safety level: 
    (:ENVIRONMENT + 2* :SAFETY) / 2
  3. Click Submit.
    Note: To clear the formula, click Clear Formula.

Adding normalization values

Add, edit, or delete normalization values for a selected level.

You can normalize a level if the outcome for that level fluctuates between a certain range of values. However this is not the range you want to pass along to the higher level in the tree. Identify the outcome range and the normalized outcome range you want to use moving forward.

Note: A question level cannot be normalized.

To add normalization values:

  1. On the Decision Tree tab, select a non-Question level, and then click Normalize Level.
  2. Click Add Value.
  3. Minimum Value—Enter the minimum value for the range.
  4. Maximum Value—Enter the maximum value for the range.
  5. Normalized Value—Enter the normalized value for the range.
  6. Click Submit.

Ordering questions

Update the sequential order of questions for reliability rankings.

To order questions:

  1. On the Decision Tree tab, click Order Questions. The system automatically populates Question, Description, and Level.
  2. Sequence Number—Enter the number for each Question to define the sequential order in which the questions should appear on the reliability ranking survey.
  3. Click Submit.