The fourth step is to explore the possible interventions that could address the problem and achieve the outcomes. You need to research and compare different types of interventions, such as training, coaching, team building, process improvement, or organizational restructuring, and how they fit your situation. You should also consider the feasibility, suitability, and acceptability of each intervention, as well as the evidence of their effectiveness and impact. You can use tools such as intervention matrix, cost-benefit analysis, or best practice review, to explore your options.