Answer:
The Problem, Alternatives, Criteria, Evaluation, Decision model (PACED) was designed to solve problems in a rational, systematic way. It involves five steps:
- Define the problem: what is our exact problem, i.e. not the symptoms, but the disease (the cause, root).
 - List the alternatives: what are our available options to solving the problem. 
 - Select the criteria: what exact things are important in order to solve this problem. 
 - Evaluate the alternatives: which alternatives meet the criteria (+), which don't (-).
 - Make a decision: add the plus signs to determine which alternative satisfies the most criteria.