The New ISSO First 90 Days ChecklistYou just got assigned as an ISSO. Now what?Your first 90 days set the tone for everything that follows. Get eMASS current, build your ConMon engine, and establish your operating rhythm before the SCA shows up and finds problems you didn't know you had.This checklist breaks your first three months into three phases:PHASE 1: DAYS 1-30 — ORIENTGet your access. Read the SSP. Meet your ISSM, sysadmins, and network team. Count your open POA&Ms. Understand what you inherited before you touch anything.PHASE 2: DAYS 31-60 — STABILIZEImport outstanding scan results into eMASS. Update every overdue POA&M. Draft your ConMon strategy with named people and real deadlines. Close the easy wins.PHASE 3: DAYS 61-90 — OPERATERun your first full ConMon cycle. Produce a status report. Build your ISSO SOP. Set 6-month targets. Run your system like you'll be audited next month.What's inside:- 5-page printable PDF- 50+ actionable checklist items organized by phase- Quick reference table for key ATO documents (SSP, SAR, POA&M, SCTM, ConMon Strategy, ATO Letter)- Key acronym guide- Regulation references: NIST SP 800-37, NIST SP 800-53 Rev 5, NIST SP 800-137, DoDI 8510.01Built for new ISSOs working DoD and federal systems. Every item comes from real workflows, not theory.Free. No catch. Just enter your email and download.— Leo Christie, The Practical ISSOhttps://leocraft233.gumroad.com/l/dwjoo