1. There are challenges to reliably testing productive language skills like writing and speaking, such as eliciting representative samples of ability and obtaining consistent scores.
2. These problems can be addressed by setting clear, appropriate tasks; restricting responses; using varied test formats; and developing well-structured scoring criteria and scales.
3. Scoring can be done using holistic scales that provide an overall assessment, or analytic scales that separately score different skill aspects. Both approaches have advantages depending on testing needs and context.