Inclusion Criteria: Diagnosis of moderate to severe Rheumatoid Arthritis (RA) or moderate to severe Plaque Psoriasis (PsO) and a candidate for treatment with etanercept in the opinion of the investigator in addition to the caring physician's intent to initiate treatment with etanercept. - Naive to etanercept. - Naive to other autoinjector pens or prefilled syringes for Tumor Necrosis Factor (TNF)-inhibitor therapy or other subcutaneous biologics for RA. - Willing to self-inject per investigator judgement at screening and capable of self-injection using the autoinjector A or B as documented at baseline by the investigator. - Able to read and write in English. -