This week the Welfare Reform Bill returns to the House of Lords, following three damaging defeats for the government last week. Disability Living Allowance, the subject of the #spartacusreport, will come into the spotlight. But so will assessment - not least the Work Capability Assessment (WCA), which is being used in relation to Employment Support Allowance (ESA). It is the process by which people in receipt of the allowance are formally tested to see if they are "fit for work".