Has the Strategy Inventory for Language Learning (SILL) passed its expiry date. The SILL (Oxford. 1990) was designed as a self-evaluation tool to measure the frequency of language learning strategies used by foreign and second language (L2) learners. With simple mathematics. https://www.nacrack.com/flash-find-Zippo-Playboy-black-White-Rabbit-Pocket-Lighter-29578-mega-super/