Provides opportunities for engaging, differentiated, open-ended problem-solving experiences. Features more than two hundred tasks grouped by content standards that reflect the NCTM Standards and the NCTM Curriculum Focal Points. 220 short open-ended tasks, 60 reproducible open-ended investigations, 9 assessment rubrics featuring authentic student work. Accompanying CD-ROM includes: 60 reproducible open-ended investigations, 9 additional reproducibles. Contents: How to Use this Resource -- What is an investigative approach to learning math? Why use mathematical tasks and investigations? -- The importance of questioning -- Section I: Assessment Using Rubrics -- What are rubrics? -- Why use rubrics? -- How do I use the rubrics in this resource? -- How do I design my own rubric? -- Section II: Nine Assessment Rubrics -- Section III: Tasks and Investigations, Grades 1-2 -- Section IV: Tasks and Investigations, Grades 3-4 -- Section V: Tasks and Investigations, Grades 5-6 -- Section.