CWIDP case studies
CWIDP · Put your knowledge to work in context.
The Certified Web and Internet Data Professional (CWIDP) is an independent credential aimed at practitioners who collect, clean, store, analyse and report on data sourced from the web. It suits data analysts, web analysts, ETL and pipeline developers, marketing and product analysts, and data stewards who regularly work with scraped, API-sourced, or log-derived datasets. The exam is delivered in multiple-choice format and spans eight domains: web acquisition; data quality, cleaning and validation; data modelling and storage; analysis and statistical methods; visualisation and reporting; privacy, ethics and regulatory compliance; security and governance; and infrastructure and automation. Expect questions that test judgement as much as recall - for example, choosing a sampling approach, spotting a validation gap in a pipeline, or recognising when a collection method creates a consent or licensing problem. The CWIDP case studies are 5 cases and about 3,640 words.
1Retailer Rendering Change Breaks a Daily Price Crawl
You operate a daily price-collection pipeline for 14 retailers and 1.2 million SKUs. The crawl starts at 02:00 UTC and must finish by 06:00 so a 07:00 report can reach merchandising.
849 words, about 4 min2Deduplicating a Messy B2B Lead Enrichment Table
Your B2B marketing team has 480,000 lead records assembled from a webinar platform, a purchased list, and three years of trade-show scans. Roughly 12% are suspected duplicates.
824 words, about 4 min3Early Stop on a 12-Arm Checkout Experiment
An e-commerce team runs a checkout experiment with 12 variants, including control. Baseline conversion is 5.0%, and the team wants to detect a 0.5 percentage-point lift.
797 words, about 4 min4Attribution Dashboard That Overstates Paid Social
Your company's marketing dashboard reports spend and conversions for seven channels using a 30-day click attribution window. Last month paid social showed ROAS 6.8 while branded search showed 1.2, and the CMO is ready to move 40% of branded-search budget into paid social.
589 words, about 3 min5Public Web Scraping Meets GDPR Deletion Requests
A lead-generation company collects publicly available professional profiles and company websites, producing 2.1 million contact records. About 18% are EU residents; records include name, job title, work email, company, profile URL, and sometimes a personal mobile number found in page text.
581 words, about 3 min