ABSTRAK
Kanker merupakan salah satu penyakit penyebab morbiditas dan mortalitas di dunia. Kondisi kanker pada anak dapat mempengaruhi konsep diri pada anak. Alat ukur konsep diri salah satunya adalah Piers-Harris 2, tetapi kuesioner ini belum pernah digunakan di Indonesia. Penelitian ini bertujuan mengidentifikasi validitas dan reliabilitas instrumen Piers-Harris Childrens Self-Concept Scale, Second Edition (Piers-Harris 2) versi Bahasa Indonesia. Penelitian ini dilakukan pada 32 anak kanker usia sekolah dan remaja berusia 7-18 tahun di rumah singgah dan sekitar Jakarta. Desain penelitian adalah cross sectional dengan teknik sampling consecutive sampling. Instrumen Piers-Harris 2 diterjemahkan dalam Bahasa Indonesia. Uji validitas, reliabilitas, skala validitas Piers-Harris 2 diuji menggunakan uji korelasi Pearson di SPSS 20. Hasil: korelasi intraskala per domain 0,55-0,74, sedangkan pada korelasi intraskala antar domain -0,01 -0,706. Nilai cronbachs alpha 0,810. 21 pernyataan memiliki r hitung > r tabel. Rata-rata konsep diri 45,19% atau bernilai positif. Instrumen Piers-Harris 2 versi Bahasa Indonesia terbukti reliabel dan valid untuk mengukur konsep diri. Pada penelitian selanjutnya diharapkan dapat melakukan uji reliabilitas tes-retes.

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ABSTRACT
Cancer is one of the causes of morbidity and mortality in the world. Conditions of cancer in children can affect self-concept in children. Self-concept measuring instrument one of them is Piers-Harris 2, but this questionnaire has not been used in Indonesia. The aim of this study was to analyze validity and reliability of an Indonesian version of the Piers-Harris Childrens Self-Concept Scale, Second Edition (Piers-Harris 2). The research method used is cross sectional with consecutive sampling technique to 32 respondents in children age 7-18 years old in shelter house and aroud Jakarta. Piers-Harris 2 questionnaire was translated into Indonesian. The validity, reliability, validity scale Piers-Harris 2, and were tested with Pearson test in SPSS 20. Inter-scale correlation per domain 0,55-0,74, while on inter-scale correlation between domain -0,01 -0,706. Cronbachs alpha 0,810. 21 item was valid. The mean total Piers-Harris 2 score was 45,19%. The Indonesia version of Piers-Harris 2 suggested that is a valid and reliable instrument for measuring self-concept in children ages 7-18 years old. For the next research it is desirable to conduct test re-test reliability.