A needs assessment is a systematic process for determining and addressing needs, or "gaps" between the current conditions and desired conditions or "wants". Each center will be responsible for conducting a needs-based community assessment of barriers to care for SCD patients. Centers may elect to assess stakeholders such as patients, providers, clinical staff, and/or community members in determining the needs of their respective communities. Data collection methods for needs assessment vary and may include both quantitative methods, such as structured surveys and qualitative methods, such as focus groups or key informant interviews. There may be some common data elements that are standardized across centers while other measures may be utilized in a specific center or centers.