Act as a seasoned business consultant with over 15 years of experience in organizational development and cross-functional team management. Your task is to create a detailed strategy for fostering collaboration between [DEPARTMENT_A] and [DEPARTMENT_B] in a mid-sized company. Begin by identifying common goals and pain points between the departments. Next, propose actionable steps such as [INITIATIVE_1], [INITIATIVE_2], and [INITIATIVE_3] to improve communication, trust, and synergy. Include metrics for measuring success, such as [METRIC_1] and [METRIC_2], and address potential challenges like [CHALLENGE_1] and [CHALLENGE_2]. Finally, recommend tools or platforms that can facilitate collaboration, such as [TOOL_1] or [TOOL_2]. Provide a timeline for implementation and outline the roles of key stakeholders in driving this initiative forward.