Diagram for the latent change score model. Legend: Coefficients linking indicators and the latent variables at both time points are constrained to be same. Acronyms of the figures are listed by reference abilities: Fluid Reasoning: In scanner-Paper Folding (PF), Matrix Reasoning (MR), Letter Sets (LSets); Out-scanner-Wechsler Adult Intelligence Scale (WAIS-III) Block design task (BD), WAIS III Letter–Number Sequencing test (LNSD), and WAIS III Matrix Reasoning test (W3MR); Processing Speed: In scanner-Digit Symbol (DS), Letter Comparison (LC), Pattern Comparison (PC); Out-scanner- Digit Symbol subtest from the Wechsler Adult Intelligence Scale-Revised (DSWAIS), Part A of the Trail making test (TMTA), and Color naming component of the Stroop (CNS); Memory: In scanner-Logical Memory (LM), Word Order recognition (WOR), Paired Associates (PA); Out-scanner- Selective Reminding Task - long-term storage sub-score (SRTlts), Selective Reminding Task - continuous long-term retrieval (SRTctrl), and Selective Reminding Task - the number of words recalled on the last trial (SRTlast); Vocabulary: In scanner-Synonyms (SYN), Antonyms (ANT), Picture Naming (PN); Out-scanner- vocabulary subtest from the WAIS III (VOC), the Wechsler Test of Adult Reading (WTAR), and American National Adult Reading Test (NART).