ILTS Computer Science (205) case studies
ILTS Computer Science (205) · Put your knowledge to work in context.
The ILTS Computer Science (205) is a content-area licensure test used in Illinois for candidates seeking an endorsement to teach computer science in the state's public schools. It is intended for aspiring and practicing educators who need to demonstrate subject-matter competence, not for general technology certification. The exam is delivered as multiple-choice questions and is organized around six domains: computer science fundamentals and algorithms; programming and software development; data structures and databases; computer systems, networks, and security; impacts of computing, ethics, and professional practice; and computer science instruction and assessment. The last two domains matter more than many candidates expect: ethics and instructional practice together account for roughly thirty percent of the blueprint, so a purely coding-focused review leaves points on the table. The ILTS Computer Science (205) case studies are 5 cases and about 3,858 words.
1The Benchmark That Measured the Harness, Not the Algorithm
Delgado's Advanced Computer Science class runs a benchmark comparing linear and binary search in Python. Each student searches a sorted list of 1,000 integers and a sorted list of 1,000,000 integers for 100 target values, timing the whole loop with time.time().
788 words, about 4 min2The Cart That Remembered the Last Student
Bhatt's introductory Python students build a book-cart module. Priya submits a solution whose central functions are defined as def add item(item, cart=[]) and def cart total(cart=[]).
778 words, about 4 min3When Adding a Permission Removed Nothing
Northside High School runs a 30-station Windows lab backed by one file server, LABFS01. The Classes share is published with the share-level permission Everyone: Full Control.
774 words, about 4 min4FreeNow and the Borrowed Password
Two seniors, Ana and Dev, built FreeNow, a web app that tells students which classmates are free during each period. Ana's friend, an office aide, lent them her student portal password for one afternoon.
768 words, about 4 min5A Common Midterm That Predicted the Wrong Thing
Nakamura teaches CS Foundations to 28 students: nine have prior programming experience, six have IEPs with extended time and text-to-speech, and four are English learners. The department common midterm is 40 multiple-choice items written by a committee two years ago, worth 100 points, with no partial credit.
750 words, about 4 min